Rated 4.74 out of 5 stars 4.74/5 from 6,020+ verified reviews

What Actually Works for Exam Focus across the UK?

Exam season brings real pressure — and plenty of hype. An honest, science-led guide to what helps you focus, and what the evidence actually supports.

🎓 An honest, science-led exam-focus guideTrusted by 2,000+ medical professionals

Revising across the UK this season? Brainzyme® ships free across the UK.

Calm, clear-headed revision focus for exam season

Brainzyme® in exam season

Show up sharp, every paper

  • Own the exam morning

    Own the exam morning.

  • Sharp to the last hour

    Sharp to the last hour.

  • Revision that sticks

    Revision that sticks.

  • Walk in calm, leave done

    Walk in calm, leave done.

Why exam season is harder than it should be

It isn’t a lack of effort. The hours you actually get for focused study have shrunk, the demands around them have grown, and the pressure is real. What breaks revision is usually running on the wrong fuel, not a lack of trying.

1
0
Hours a week the average UK student now studies independently
2
0%
Of students work paid jobs during term, so the focused hours matter more
3
0%
Of UK students feel under pressure during exams
4
0%
Of students reach for more energy drinks during exam season

Sources: HEPI / Advance HE Student Academic Experience Survey 2025; Save My Exams student survey, 2024; YouGov exam-season survey, 2019.

So making the hours you do get count is the whole game. That’s where the right nutrition fits in.

Does This Feel Familiar?

Long revision days have a way of grinding focus down. See how many of these you recognise.

Quick revision self-check
Tap any below that applied to you
0
of 6 signs selected

Where Nutrition Fits In

Where nutrition fits into exam-season focus

You’re looking for something practical to support your focus through a demanding stretch. That’s a reasonable search, and it deserves a straight answer. Nutrition won’t do the revision for you, but it gives your brain the raw materials it runs on.

What nutrition can do is well established: the brain runs on specific nutrients, and when you get the right ones in, concentration, mood and mental stamina all benefit. The rest of this page walks through what the science actually shows.

What Nutrition Actually Can Do

What nutrition can do for focus and mental stamina

Your brain uses roughly 20% of your body’s energy and needs a constant supply of specific nutrients to perform, and when those are depleted by long days and poor sleep, concentration suffers. Here’s what the research links to attention, mood and mental stamina:

🧠

L-Tyrosine

A plant-derived precursor in the dopamine pathway: the chemistry behind motivation and the drive to start and stay with a task.

🍵

Matcha & Green Tea

L-theanine is studied for calm, alert focus: a relaxed-but-sharp mental state without jitters or crashes.

💪

B Vitamins (B5 & B6)

Contribute to normal cognitive and psychological function and to the reduction of tiredness and fatigue: the difference between a focused afternoon and a foggy one.

💡

Zinc & Magnesium

Zinc contributes to normal cognitive function; magnesium supports normal nervous-system function and energy metabolism.

Brainzyme FOCUS PRO with focus-supporting whole foods
🔗

The Full Chain — Not Just One Ingredient

Most focus supplements give you one ingredient and call it done. Brainzyme® FOCUS PRO™ works differently: each formula delivers the full chain of precursors, cofactors and plant compounds your brain needs to make neurotransmitters naturally, across four functional layers at once.

Evidence: 115 Peer-Reviewed Studies

Tap any ingredient to view the studies behind the claims on this page. All citations are independent peer-reviewed journals.

21 ingredients 115 studies PubMed · DOI · PMC · ScienceDirect

Across the range: Delivered in all three (ORIGINAL 400 mg / PRO 350 mg / ELITE 350 mg as EMT blend).

  1. A double‑blind, placebo‑controlled study evaluating the effects of natural stimulant and L‑theanine both alone and in combination on cerebral blood flow, cognition and mood (2015) Psychopharmacology . Available at: pubmed.ncbi.nlm.nih.gov/25761837
  2. Effects of L‑theanine on cognitive function in middle‑aged and older adults: a randomized placebo‑controlled study (2021) Journal of Medicinal Food . Available at: pubmed.ncbi.nlm.nih.gov/33751906
  3. Green tea extract enhances parieto‑frontal connectivity during working‑memory processing (2014) Psychopharmacology . Available at: pubmed.ncbi.nlm.nih.gov/24643507
  4. The Effects of Green Tea Extract on Working Memory in Healthy Women (2018) Nutrients . Available at: pubmed.ncbi.nlm.nih.gov/29484360
  5. Green tea effects on cognition, mood and human brain function: a systematic review (2017) Phytomedicine . Available at: pubmed.ncbi.nlm.nih.gov/28899506
  6. Effects of L‑theanine administration on stress‑related symptoms and cognitive functions in healthy adults: a randomized, placebo‑controlled study (2019) Nutrients . Available at: pubmed.ncbi.nlm.nih.gov/31623400
  7. The effects of the green‑tea amino acid L‑theanine on stress/anxiety outcomes: systematic review (2020) Nutrients . Available at: pubmed.ncbi.nlm.nih.gov/31758301
  8. High‑dose L‑theanine–natural stimulant combination improves ERP P3b and selective attention after sleep loss (2024) Nutrients . Available at: pubmed.ncbi.nlm.nih.gov/40789769
  9. The deployment of intersensory selective attention: a high-density electrical mapping study of the effects of theanine. Clinical Neuropharmacology . Available at: www.ncbi.nlm.nih.gov/pubmed/17272967
  10. L-Theanine and caffeine in combination affect human cognition as evidenced by oscillatory alpha-band activity and attention task performance. The Journal of Nutrition . Available at: www.ncbi.nlm.nih.gov/pubmed/18641209
  11. L-Theanine reduces psychological and physiological stress responses. Biological Psychology . Available at: www.ncbi.nlm.nih.gov/pubmed/16930802
  12. L-Theanine, a natural constituent in tea, and its effect on mental state. Asia Pacific Journal of Clinical Nutrition . Available at: www.ncbi.nlm.nih.gov/pubmed/18296328
  1. GABA and the blood-brain barrier — is there a transport mechanism?. doi.org/10.1111/j.1749-6632.2009.04824.x
  2. Oral GABA intake: pharmacokinetics and effects on brain GABA levels in humans.. doi.org/10.1016/j.biopsycho.2015.09.009

Authorised health claim: Magnesium contributes to normal psychological function and reduction of tiredness and fatigue.

Across the range: Delivered by PRO (56 mg) and ELITE (56 mg).

  1. Neuroprotective effects of magnesium: implications for neuroinflammation and cognition (2024) Frontiers in Endocrinology . Available at: pubmed.ncbi.nlm.nih.gov/20152124
  2. Magnesium Citrate Increases Pain Threshold and Reduces TLR4 Concentration in the Brain (2021) Biological Trace Element Research . Available at: pubmed.ncbi.nlm.nih.gov/32989649
  3. Dietary magnesium intake is related to larger brain volumes and lower white matter lesions with notable sex differences (2023) European Journal of Nutrition . Available at: pubmed.ncbi.nlm.nih.gov/36899275
  4. Serum Magnesium and Cognitive Function Among Qatari Adults (2020) Frontiers in Aging Neuroscience . Available at: pubmed.ncbi.nlm.nih.gov/32351381

Authorised health claim: Vitamin B6 contributes to normal psychological function and reduction of tiredness and fatigue.

Across the range: Delivered in all three (2.8 mg per serving).

  1. Vitamin B6 for cognition (2003) Cochrane Database of Systematic Reviews . Available at: pubmed.ncbi.nlm.nih.gov/14584010
  2. Vitamin and mineral supplementation for maintaining cognitive function in cognitively healthy adults in late life (2018) Cochrane Database of Systematic Reviews . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC6353240
  3. Effects of high-dose B-vitamin complex with vitamin C and minerals on mood and cognitive performance during intense mental processing (2010) Human Psychopharmacology: Clinical and Experimental . Available at: pubmed.ncbi.nlm.nih.gov/20454891
  4. B Vitamins and the Brain: Mechanisms, Dose and Efficacy—A Review (2016) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC4772032
  5. Associations between vitamin B6/B9/B12 status and cognitive performance in U.S. older adults (NHANES 2011–2014) (2022) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC8962758

Across the range: Delivered exclusively by ELITE (90 mg, 18 Bn CFU).

  1. Probiotics: The Next Dietary Strategy against Brain Aging (2022) Preventive Nutrition and Food Science (PNF) . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC9007707
  2. Health-Promoting Effects of Lactobacillus acidophilus and Its Technological Applications in Fermented Food Products and Beverages (2024) Fermentation . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC8754107
  3. The gut-brain axis: interactions between enteric microbiota, central and enteric nervous systems. Annals of Gastroenterology . Available at: www.ncbi.nlm.nih.gov/pmc/articles/PMC4367209
  4. Probiotic, Prebiotic, and Brain Development. Nutrients . Available at: doi.org/10.3390/nu9111247
  5. Effect of Probiotics on Central Nervous System Functions in Animals and Humans: A Systematic Review. Journal of Neurogastroenterology and Motility . Available at: doi.org/10.5056/jnm16018

Across the range: Delivered exclusively by ELITE (270 mg turmeric & curcumin).

  1. Curcumin‑rich curry consumption and neurocognitive function in community‑dwelling older adults (4.5‑year cohort) (2022) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC8952785
  2. Curcumin: A Golden Approach to Healthy Aging: A Systematic Review of the Evidence (2024) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC2386914
  3. Short‑term curcumin supplementation increases serum BDNF: meta‑analysis of randomized trials (2019) Journal of Functional Foods . Available at: pubmed.ncbi.nlm.nih.gov/24914461
  4. Curcumin promotes neurogenesis via Wnt/β‑catenin signalling in mouse models (2020) Brain Research . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC4060834
  5. Curcumin improves cognition with increased hippocampal PSD95 and BDNF in mice (2025) Scientific Reports . Available at: pubmed.ncbi.nlm.nih.gov/39774610
  6. Curcumin intervention for cognitive function in different types of people: A systematic review and meta‐analysis. Phototherapy Research . Available at: pubmed.ncbi.nlm.nih.gov/36652384
  7. Piperine, the potential functional food for mood and cognition (2008) Food and Chemical Toxicology . Available at: pubmed.ncbi.nlm.nih.gov/18639606

Across the range: Delivered by PRO (240 mg) and ELITE (240 mg).

  1. Acute, dose-dependent cognitive effects of Ginkgo biloba, Panax ginseng and their combination in healthy young volunteers: differential interactions with cognitive demand (2002) Human Psychopharmacology: Clinical and Experimental . Available at: pubmed.ncbi.nlm.nih.gov/12404705
  2. The dose‑dependent cognitive effects of acute administration of Ginkgo biloba to healthy young volunteers (2000) Psychopharmacology . Available at: pubmed.ncbi.nlm.nih.gov/11026748
  3. Differential cognitive effects of Ginkgo biloba after acute and chronic treatment in healthy young volunteers (2005) Psychopharmacology . Available at: pubmed.ncbi.nlm.nih.gov/23001963
  4. Neuroprotective effects of Ginkgo biloba extract. Cellular and Molecular Life Sciences . Available at: doi.org/10.1007/s00018-003-3080-1
  5. Ginkgo biloba extract review on CNS effects. Ann Clin Psychiatry . Available at: pubmed.ncbi.nlm.nih.gov/12938868
  6. Demonstration of the "anti-stress" activity of an extract of Ginkgo biloba using a discrimination learning task. General Pharmacology: The Vascular System . Available at: doi.org/10.1016/0306-3623(94)90111-2
  7. Chemical analysis of Ginkgo biloba leaves and extracts. Journal of Chromatography A . Available at: doi.org/10.1016/S0021-9673(02)00172-3

Across the range: Delivered exclusively by ELITE (400 mg).

  1. Cognition‑enhancing effect of Panax ginseng in healthy adults: randomized, double‑blind, placebo‑controlled (2019) Journal of Ginseng Research . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC6989239
  2. Effects of Korean red ginseng on human gray‑matter volume and cognition: randomized, double‑blind, placebo‑controlled (2021) Nutritional Neuroscience . Available at: pubmed.ncbi.nlm.nih.gov/33217050
  3. Emerging evidence that ginseng components improve cognitive function: narrative review (2024) Aging and Disease . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC11068985
  4. Effects of Korean red ginseng in individuals exposed to high stress: randomized, double‑blind, placebo‑controlled (2019) Journal of Ginseng Research . Available at: pubmed.ncbi.nlm.nih.gov/31308812
  5. Safety and tolerability of Korean red ginseng in healthy adults: 24‑week randomized trial (2018) Journal of Alternative and Complementary Medicine . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC6190494
  6. Dose dependent changes in cognitive performance and mood following acute administration of Ginseng to healthy young volunteers (2001) Nutritional Neuroscience . Available at: pubmed.ncbi.nlm.nih.gov/11842896
  7. Modulation of cognition and mood following administration of single doses of Ginkgo biloba, ginseng, and a ginkgo/ginseng combination to healthy young adults (2002) Physiology & Behavior . Available at: pubmed.ncbi.nlm.nih.gov/12020739
  8. Effects of Panax ginseng, consumed with and without glucose, on blood glucose levels and cognitive performance during sustained ‘mentally demanding’ tasks. Journal of Psychopharmacology . Available at: doi.org/10.1177%2F0269881106061516

Across the range: Delivered exclusively by ELITE (150 mg).

  1. Improving Cognitive Function with Nutritional Supplements in Aging: A Comprehensive Narrative Review of Clinical Studies Investigating the Effects of Vitamins, Minerals, Antioxidants, and Other Dietary Supplements (2023) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC10746024
  2. L‐carnitine for cognitive enhancement in people without cognitive impairment (2017) Cochrane Database of Systematic reviews . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC6464592
  3. L-Carnitine and acetyl-L-carnitine roles and neuroprotection in developing brain (2018) Neurochemical Research . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC5621476
  4. Chronic acetyl-l-carnitine alters brain energy metabolism and increases noradrenaline and serotonin content in healthy mice (2012) Neurochemistry International . Available at: doi.org/10.1016/j.neuint.2012.04.008

Across the range: Delivered in all three (ORIGINAL 330 mg / PRO 330 mg / ELITE 330 mg).

  1. Improved cognitive performance in human volunteers following administration of guaraná extract: comparison and interaction with Panax ginseng (2004) Pharmacology Biochemistry and Behavior . Available at: pubmed.ncbi.nlm.nih.gov/15582012
  2. A double‑blind, placebo‑controlled, multi‑dose evaluation of the acute behavioural effects of guaraná in humans (2007) Psychopharmacology . Available at: pubmed.ncbi.nlm.nih.gov/16533867
  3. Acute effects of different multivitamin/mineral preparations with guaraná on mood and cognition (2013) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC3798923
  4. Vitamin/mineral complex with guaraná attenuates mental fatigue and improves task performance prior to exercise (2015) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC4555111
  5. Effect of guaraná on cognitive performance: systematic review and meta‑analysis (2023) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC9865053
  6. Cognitive effects of guaraná supplementation with maximal‑intensity cycling: matched natural stimulant comparison (2023) Nutrients . Available at: pubmed.ncbi.nlm.nih.gov/36146946
  7. Effects of acute guaraná ingestion on cognitive performance and vagal modulation in healthy adults (2024) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC11206275
  8. Mechanisms involved in anti-aging effects of guarana in caenorhabditis elegans. The Brazilian Journal of Medical and Biological Research . Available at: doi.org/10.1016/j.pbb.2004.07.014
  9. Guarana provides additional stimulation over caffeine alone in the planarian model. PLOS ONE . Available at: doi.org/10.1371/journal.pone.0123310

Across the range: Delivered exclusively by PRO (230 mg). The dopamine-pathway primary active.

  1. The effects of tyrosine on cognitive performance during extended wakefulness (1995) Aviation, Space, and Environmental Medicine . Available at: pubmed.ncbi.nlm.nih.gov/7794222
  2. Tyrosine improves cognitive performance and reduces blood pressure in cadets after one week of combat training (1999) Brain Research Bulletin . Available at: pubmed.ncbi.nlm.nih.gov/10230711
  3. Effect of tyrosine on cognitive function and blood pressure under stress (1994) Psychopharmacology . Available at: pubmed.ncbi.nlm.nih.gov/8293316
  4. Working memory reloaded: tyrosine repletes updating in the N‑back task (2013) Frontiers in Behavioral Neuroscience . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC3863934
  5. Tyrosine promotes cognitive flexibility in task switching (2015) Psychopharmacology . Available at: pubmed.ncbi.nlm.nih.gov/25598314
  6. Dose‑dependent effects of oral tyrosine on plasma tyr and cognition in older adults: a randomized crossover trial (2017) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC5748730
  7. Effects of L‑Tyrosine on working memory and inhibitory control are determined by DRD2 genotype (2016) Cortex . Available at: pubmed.ncbi.nlm.nih.gov/27403851
  8. Neuro‑cognitive effects of acute tyrosine administration on cognitive control in young adults (2018) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC6084775
  9. Baseline‑dependent effect of dopamine's precursor L‑tyrosine on the updating of working memory (2020) Psychopharmacology . Available at: pubmed.ncbi.nlm.nih.gov/32133585
  10. Treatment with tyrosine, a neurotransmitter precursor, reduces environmental stress in humans. Brain Research Bulletin . Available at: doi.org/10.1016/0361-9230(89)90096-8
  11. Tyrosine improves working memory in a multitasking environment. Pharmacology Biochemistry and Behavior . Available at: doi.org/10.1016/S0091-3057(99)00094-5

Across the range: Delivered in all three (ORIGINAL 195 mg / PRO 290 mg / ELITE 195 mg).

  1. Choline Intake Correlates with Cognitive Performance among Elder Adults in the United States (2021) Behavioural Neurology . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC8570899
  2. Citicoline and Memory Function in Healthy Older Adults: A Randomized, Double-Blind, Placebo-Controlled Clinical Trial (2021) The Journal of Nutrition . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC8349115
  3. The relation of dietary choline to cognitive performance and white-matter hyperintensity in the Framingham Offspring Cohort (2011) The American Journal of Clinical Nutrition . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC3252552
  4. Acetylcholine bidirectionally regulates learning and memory (2022) Journal of Neurorestoratology . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC9415189
  5. The Role of Choline in Neurodevelopment (2023) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC10343507
  6. Maternal choline supplementation during the third trimester of pregnancy improves infant information processing speed: a randomized, double-blind, controlled feeding study (2018) The FASEB Journal . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC6988845
  7. Association between Maternal Choline, Fetal Brain Development, and Child Neurocognition: Systematic Review and Meta-Analysis of Human Studies (2022) Advances in Nutrition . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC9776654
  8. Choline: an important nutrient in brain development, liver function and carcinogenesis. Journal of the American College of Nutrition . Available at: doi.org/10.1080/07315724.1992.10718251
  9. Nutritional importance of choline for brain development. Journal of the American College of Nutrition. Available at: doi.org/10.1080/07315724.2004.10719433

Across the range: Delivered by PRO (20 mg) and ELITE (30 mg).

  1. Neuroprotective effects of Lepidium meyenii (Maca) (2010) Annals of the New York Academy of Sciences . Available at: pubmed.ncbi.nlm.nih.gov/20633111
  2. Neuroprotective effects of macamide from maca (Lepidium meyenii) on corticosterone-induced hippocampal impairments through anti-inflammatory, neurotrophic and synaptic protection properties (2021) Food & Function . Available at: pubmed.ncbi.nlm.nih.gov/34606547
  3. Oral Supplementation with Maca Improves Social Memory and Restores Social Recognition Impairments by Augmenting Oxytocinergic Signaling (2023) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC9954495
  4. Preservation of Cognitive Function by Lepidium meyenii (Maca) is Associated with Improvement of Mitochondrial Activity and Upregulation of Autophagy-Related Proteins in Middle-Aged Mouse Cortex (2016) Evidence-Based Complementary and Alternative Medicine . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC5018343

Authorised health claim: Selenium contributes to the protection of cells from oxidative stress.

Across the range: Delivered exclusively by ELITE (13.8 mcg).

  1. Association between selenium intake and cognitive function among older adults in the US: National Health and Nutrition Examination Surveys 2011–2014 (2023) Journal of Nutritional Science . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC10173086
  2. Dietary selenium intake, hypertension and cognitive function among US adults: NHANES 2011–2014 (2024) Scientific Reports . Available at: pubmed.ncbi.nlm.nih.gov/35063231
  3. Associations between multiple trace elements, executive function, and cognitive impairment in older adults (2024) Nutrients . Available at: pubmed.ncbi.nlm.nih.gov/16895884

Authorised health claim: Vitamin E contributes to the protection of cells from oxidative stress.

Across the range: Delivered exclusively by ELITE (6.03 mg alpha-TE).

  1. Vitamin and mineral supplementation for maintaining cognitive function in cognitively healthy adults in late life (2018) Cochrane Database of Systematic Reviews . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC6353240
  2. A randomized trial of vitamins C and E and beta carotene in the prevention of cognitive change in women (2009) Archives of Internal Medicine . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC2752297

Authorised health claim: Riboflavin contributes to normal energy metabolism and reduction of tiredness and fatigue.

Across the range: Delivered exclusively by ELITE (0.7 mg).

  1. Association of vitamin B2 intake with cognitive performance in older adults: a cross-sectional study (2023) Journal of Translational Medicine . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC10691015
  2. Association between vitamin B2 intake and cognitive performance among older adults: a cross-sectional study from NHANES (2024) Scientific Reports . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC11415396
  3. Association between dietary riboflavin intake and cognitive decline in older adults: a cross-sectional analysis (2025) Nutritional Neuroscience . Available at: pubmed.ncbi.nlm.nih.gov/39012764

Authorised health claim: Biotin contributes to normal psychological function.

Across the range: Delivered exclusively by ELITE (25 mcg).

  1. Biotin (comprehensive review of human biology, biomarkers, and status) (2024) Advances in Nutrition . Available at: pubmed.ncbi.nlm.nih.gov/35901964
  2. Indicators of marginal biotin deficiency and repletion in humans: validation of 3-hydroxyisovaleric acid excretion and a leucine challenge (2002) The American Journal of Clinical Nutrition . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC1435357
  3. Trends in daily use of biotin supplements among US adults, 1999–2016 (2020) JAMA . Available at: pubmed.ncbi.nlm.nih.gov/32780133

Authorised health claim: Zinc contributes to normal cognitive function.

Across the range: Delivered in all three (ORIGINAL 3 mg / PRO 3 mg / ELITE 3 mg).

  1. Effects of zinc supplementation on cognitive function in healthy middle-aged and older adults: the ZENITH study (2006) British Journal of Nutrition . Available at: pubmed.ncbi.nlm.nih.gov/17010236
  2. Plasma trace elements and cognitive function in older men and women: The Rancho Bernardo study (2008) The Journal of Nutrition, Health & Aging . Available at: pubmed.ncbi.nlm.nih.gov/18165841
  3. Effects of Zinc Supplementation on Inflammatory and Cognitive Parameters in Middle-Aged Women (2023) Nutrients . Available at: www.ncbi.nlm.nih.gov/sites/entrez/37892471
  4. Zinc intake, status and indices of cognitive function in children and adults: a systematic review (2015) European Journal of Clinical Nutrition . Available at: pubmed.ncbi.nlm.nih.gov/16254577

Authorised health claim: Iodine contributes to normal cognitive function.

Across the range: Delivered in all three (ORIGINAL 100 mcg / PRO 75 mcg / ELITE 75 mcg).

  1. Iodine supplementation improves cognition in mildly iodine-deficient children (2009) American Journal of Clinical Nutrition . Available at: pubmed.ncbi.nlm.nih.gov/19726593
  2. Iodine supplementation improves cognition in iodine-deficient schoolchildren in Albania: a randomized, controlled, double-blind study (2006) American Journal of Clinical Nutrition . Available at: pubmed.ncbi.nlm.nih.gov/16400058
  3. Improved iodine status is associated with improved mental performance of schoolchildren in Benin (2000) American Journal of Clinical Nutrition . Available at: pubmed.ncbi.nlm.nih.gov/11063446
  4. Maternal urinary iodine concentration in pregnancy and children’s cognition: results from a population-based birth cohort in an iodine-sufficient area (2014) BMJ Open . Available at: pubmed.ncbi.nlm.nih.gov/24928597

Authorised health claim: Vitamin B12 contributes to normal psychological function and energy metabolism.

Across the range: Delivered in all three (5 mcg as methylcobalamin).

  1. Effects of vitamin B-12 supplementation on neurologic and cognitive function in older people: a randomized controlled trial (2015) The American Journal of Clinical Nutrition . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC4548176
  2. Results of 2-year vitamin B treatment on cognitive performance: secondary data from a randomized controlled trial (B-PROOF) (2014) Neurology . Available at: pubmed.ncbi.nlm.nih.gov/25391305
  3. Vitamin B12, cognition, and brain MRI measures (2011) Neurology . Available at: pubmed.ncbi.nlm.nih.gov/17991650

Authorised health claim: Vitamin C contributes to normal psychological function and reduction of tiredness and fatigue.

Across the range: Delivered by PRO (16 mg) and ELITE (16 mg).

  1. Vitamin C supplementation promotes mental vitality in healthy young adults: results from a cross-sectional analysis and a randomized, double-blind, placebo-controlled trial (2021) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC8783887
  2. Plasma Vitamin C Concentrations and Cognitive Function: A Cross-Sectional Study (2019) Frontiers in Aging Neuroscience . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC6454201
  3. Vitamin C Status and Cognitive Function: A Systematic Review (2017) Nutrients . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC5622720
  4. The Contribution of Plasma and Brain Vitamin C on Age- and Gender-Related Differences in Cognition (2020) Frontiers in Integrative Neuroscience . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC6353240
  5. Antioxidative and Anti-Inflammatory Activity of Ascorbic Acid (2022) International Journal of Molecular Sciences . Available at: pmc.ncbi.nlm.nih.gov/articles/PMC9598715
  6. Effects of high-dose B-vitamin complex with vitamin C and minerals on mood and cognitive performance during intense mental processing (2010) Human Psychopharmacology: Clinical and Experimental . Available at: pubmed.ncbi.nlm.nih.gov/20454891

A Typical Revision Day on Brainzyme®

A typical revision day on Brainzyme

Not a transformation story, just what a study day looks like when your brain has the nutrients it needs.

8 AM
☕

Morning dose

Two capsules with breakfast. No loading phase, no complicated routine.

L-tyrosine · Matcha · B-complex
9–11 AM
🧠

Calm-alert revision

L-theanine smooths the edges off the lift. The first session is easier to start: clearer, not jittery.

L-theanine + matcha synergy
1–3 PM
⚡

Sustained afternoon

The dose lasts roughly 6–8 hours. Most people skip the typical mid-afternoon dip and keep the last productive hour.

Reduces tiredness & fatigue
Evening
🌙

Wears off naturally

No buildup, no next-day grogginess. The next study day starts fresh.

Plant-based, non-habit-forming

Day-to-day vs long-term: matcha and L-tyrosine act from the first dose; B-vitamins, zinc and magnesium build longer-term cognitive support over the first few weeks. Effects vary, that’s what the 365-day money-back guarantee is for.

What to Look for in a Focus Supplement

Buyer's guide checklist for a focus supplement

If you’re going to invest in brain nutrition before exams, here’s what separates legitimate products from marketing-driven ones:

  • ✓
    Named, substantiated nutrients

    Authorised health claims tied to specific vitamins and minerals, not vague “brain-boosting” promises or hidden blends.

  • ✓
    GMP and HACCP certification

    Manufacturing standards that guarantee consistency, purity and safety.

  • ✓
    No inflated claims

    If it promises to replace medication or guarantee grades, walk away. Legitimate brands stay within authorised health-claim boundaries.

  • ✓
    Thousands of verified reviews

    4.74/5 from 6,020+ verified reviewers, not a handful of suspiciously perfect ones.

  • ✓
    A meaningful returns policy

    A 365-day money-back guarantee shows a company believes in its product.

  • ✓
    Plant-powered, allergen-free, vegan

    Clean formulation without unnecessary fillers or common allergens.

How FOCUS PRO™ Helps — Swipe Through

Six revision frictions, and what changes when your brain is properly fuelled. Swipe →

  • Start without the stall

    Start without the stall

    1
    Can’t get going? L-tyrosine feeds the dopamine pathway behind motivation — supporting the drive to actually start.
  • Hold focus past hour one

    Hold focus past hour one

    2
    Concentration slipping? Plant precursors and B-vitamins help sustain focus through a long revision session.
  • Beat the afternoon crash

    Beat the afternoon crash

    3
    2pm slump? B5 and B6 contribute to the reduction of tiredness and fatigue, so you keep the last productive hour.
  • Clear the fog on the page

    Clear the fog on the page

    4
    Mind going blank? The real nutrients behind clear thinking, supporting steady mental performance when it counts.
  • Walk in calm on exam day

    Walk in calm on exam day

    5
    Exam-day pressure? FOCUS ELITE™ adds plant-powered support for calm, composed focus on the day.
  • From £18, 365-day returns

    From £18, 365-day returns

    6
    Worth the risk? From £18, plant-powered and made in Scotland, with a 365-day money-back guarantee.

Choose Your Formula

Three plant-powered formulas, each tuned to a different kind of focus support. UK's first natural focus supplement brand, trusted by 2,000+ medical professionals since 2016.

Done waiting for your focus to fix itself? Pick your formula. Real plant-powered support.
GMP & HACCPMade in Scotland to pharma standards
Plant-poweredVegan, no synthetic fillers
From day 1No loading phase
365-day returnsFull refund, no questions
Free UK deliveryOn every order

Join the Brainzyme® Community

Trusted by 120,000+ happy customers. Swipe →

  • Brainzyme® customer — Amber
  • Brainzyme® customer — Dennis
  • Brainzyme® customer — Emely
  • Brainzyme® customer — Charlotte
  • Brainzyme® customer — Willow
  • Brainzyme® customer — Kieran
  • Brainzyme® customer — Sarah
  • Brainzyme® customer — Farah
  • Brainzyme® customer — Jeannie

Real Student & Customer Stories

Honest, unscripted experiences from real customers.

  • Farah

  • Charlotte

  • Haylee

  • Brian

  • Jessica

  • Van Van

  • Pete

  • SJ

  • Emma

  • Amy

  • William

  • Scarlett

  • Caitlin

  • Kieran

  • Bethany

  • Norman

  • Pippa

  • Karl

  • Steph

  • Klaudia

  • Serene

  • Dani

  • Emmie

  • Gabby

  • Janne

  • Sweet Stems

    • Trusted by Medical Professionals

    Over 2,000 medical professionals have personally used and recommended Brainzyme®.

  • “Brainzyme® [FOCUS™] contains matcha, guarana and choline, which are all well known to boost cognitive effects.”

    Dr. Sarah Nicholls · Doctor (BSc BMBS), UK

  • “I chose to partner with Brainzyme® to stay focused when my brain feels foggy or scattered on really full days.”

    Dr. Amelia Kelley, PhD · Author, Therapist, Professor & TEDx Speaker, US

  • “All the ingredients should help you to concentrate better and think faster.”

    Dr. med. Cordelia Schott · Specialist in orthopaedics & sports medicine, Germany

  • Dr. Christian Galli

    “As a cognitive health expert, I have tested a few supplements, but Brainzyme® FOCUS PRO™ stands out as the best cognitive focus supplement.”

    Dr. Christian Galli · Neurologist, Austria

  • Dr. med. Georgia Brunner

    “I definitely experienced increased energy with Brainzyme®. I have patients with low energy and concentration problems, and they prefer FOCUS PRO™ and FOCUS ELITE™.”

    Dr. med. Georgia Brunner · Psychiatry and Psychotherapy, Switzerland

  • Dr. Natalia Bielczyk

    “Despite almost a decade in neuroscience research, this is the first time I’m testing plant-based focus supplements. My mood is very stable, and cognitive flexibility at work seems to have improved. My verdict: on many levels, it works.”

    Dr. Natalia Bielczyk · Neuroscientist & Founder, Netherlands

  • Dr. Michal Nowicki

    “The tangible benefits I've derived from Brainzyme® FOCUS™ are indispensable to my career, and I am genuinely grateful.”

    Dr. Michal Nowicki · MD, MPharm - Cardiologist, Poland

  • “FOCUS ELITE™ is the one that's really made a difference for me. I've noticed more focus, calm energy, and less of that scattered feeling that can take over. And I've been recommending them to my clients.”

    Catherine Amido · Registered Nutritional Therapist, UK

  • Dr. Tracy King

    “I tried all three Brainzyme® FOCUS™ supplements. PRO™ is the one I reach for when I need to get things done, like high-output days, deadlines, or focus sprints, without the crash.”

    Dr. Tracy King · Chartered Clinical Psychologist, UK

  • “I love them. I cannot recommend them highly enough if you are struggling with focus or brain fog.”

    Helen Villiers · Psychotherapist (MBACP), UK

  • “It can really help and it provides a very viable complement to focus and concentration meds.”

    Ludovico Sadic · Neuroscientist (PhD), Spain

  • “Brainzyme® contains a range of nutrients known to help with focus and concentration.”

    Christine Bailey · Nutritional therapist (MSc MBANT CNHC), UK

  • “It's been a few months since I started taking it, and I've truly noticed a difference in my concentration, my stress levels, and my emotional balance. So, I highly recommend it.”

    Elodie Malek · Hypnotherapist, France

  • Dr. Sumera Baloch

    “I wanted to try something to help me with focus and concentration. I found [Brainzyme®] FOCUS™. I tried it, and I have to be honest, it actually helped me, no doubt!”

    Dr. Sumera Baloch · Doctor, UK

  • Dr. Alba Morais

    “I use Brainzyme® very often to help me with work as it helps me to focus, relax and prioritise my tasks.”

    Dr. Alba Morais · Core Trust Doctor: Trauma & Orthopaedics, UK

  • Dr. Saurav Kayastha

    “I have been using this product for a little less than a year for energy, focus and procrastination. This product works like magic. I would highly recommend it.”

    Dr. Saurav Kayastha · Physician, US

  • Daniel Curran

    “I bought the Starter Bundle and have been switching between the 3 types for 2 weeks now. A noticeable difference in my mood, focus and motivation. It takes about an hour to kick in the morning.”

    Daniel Curran · NHS Physiotherapist, UK

  • Victoria Bell

    “Each formula has a different combination of vitamins, minerals, amino acids and other food-based nutrients. These have a synergistic effect on your nervous system and promote calmness, alertness and focus.”

    Victoria Bell · Registered Nutritional Therapist, UK

  • Miriam Liguori

    “I noticed a huge improvement focusing on tasks and I feel more awake and energised on a daily basis.”

    Miriam Liguori · ICU Nurse, Germany

  • Devina Dickson

    “I have been using Brainzyme® focus for over a year now, and find my focus is better and I can concentrate for longer periods.”

    Devina Dickson · Mental Health Nurse, UK

  • Emma Lee

    “It has officially been a life changer. I am pleased with the results so far. I wish I had found Brainzyme® years earlier.”

    Emma Lee · Biomedical Scientist, UK

  • Jonny Hugill

    “I noticed increased focus, improved mood and wellbeing. It has helped me get more done and feel more involved in things.”

    Jonny Hugill · Registered Mental Health Nurse, UK

  • Corinne Z

    “I have been suffering from Long Covid then discovered Brainzyme® and now I have more energy and enjoy everything I do again.”

    Corinne Z · Physiotherapist, Germany

    • Which best describes you?

    Sounds like the low-drive type.

    You're missing the spark to start more than the calm. FOCUS PRO™ is built for this: it supplies the building blocks along the full dopamine synthesis pathway — nutrients that contribute to normal cognitive function and help reduce tiredness and fatigue.

    Explore FOCUS PRO™ →

    Sounds like the overwhelmed type.

    For you it's not too little drive — it's too much noise in your head. FOCUS ELITE™ is formulated as a daytime formula for calm, stress-free focus: it supports the brain's natural GABA activity so you stay focused without tension — calm without drowsiness.

    Explore FOCUS ELITE™ →

    Recognise yourself in both?

    That's common — low-drive and overwhelm patterns overlap. Answer a few quick questions and we'll point you to the formula that fits you best:

    Three questions — we'll suggest a formula

    No data collected. The recommendation appears below the third answer.

    Question 1 of 3

    1. What are you most hoping to support?

    Question 2 of 3

    2. How would you describe a typical week?

    Question 3 of 3

    3. How experienced are you with focus supplements?

    Exam season in your city

    Exam-season questions, answered

    Yes. Brainzyme® FOCUS PRO™ is plant-powered brain nutrition that contributes to normal cognitive function through vitamins, minerals and plant extracts: the raw materials behind focus, motivation and mental stamina. Over 6,020 verified customers have found it genuinely supportive through demanding stretches like revision.
    Most customers notice sustained focus on study days within the first week of daily use. Matcha and L-tyrosine act from the first dose, while B vitamins, zinc and magnesium build longer-term cognitive support over the first few weeks. There’s no loading phase, so you can start it during exam week.
    FOCUS PRO™ supports strong focus and motivation, ideal for getting through revision. FOCUS ELITE™ adds plant-powered support for stress-free focus and a positive mood, which suits the exam-day composure beat. Take the 60-second quiz to find your fit.
    FOCUS PRO™ and FOCUS ELITE™ are formulated for adults. FOCUS ORIGINAL™ is the milder formula, suitable from age 10, see the individual product pages for full age guidance.
    Brainzyme® is a food supplement under UK and EU regulations: plant-powered brain nutrition (real vitamins, minerals and plant extracts) formulated to support everyday cognitive function.
    Brainzyme® comes with a 365-day money-back guarantee. If you’re not satisfied for any reason, return it for a full refund and try it risk-free. Made in Scotland by Nutraceutical Logistics Global. Brainzyme® was founded in Edinburgh in 2016.

    Plan Your Path

    Three quick tools to help you decide if — and which — Brainzyme® is right for your exam season.

    How far out is your exam?

    Pick your timeframe for a simple, sensible plan — the earlier you build the habit, the steadier it feels on the day.

    —
    Your exam runway

    Pick your timeframe for a simple plan.

    FOCUS is a plant-based food supplement that supports normal concentration — one part of a good exam routine alongside food and revision.

    What to expect over your first few weeks

    Honest expectations from customer feedback — some people feel more, some less. The 365-day return is there for that reason.

    • DAY 1

      First dose — calm-alert lift

      Most people notice a clearer, calmer focus within an hour of the first two capsules. No buildup phase needed — the matcha and guarana are active from dose one.

    • WEEK 1

      Settling into a rhythm

      You learn what time of day suits you (most take their dose with breakfast). Effects feel more predictable. Afternoon study energy is steadier.

    • WEEK 3

      The longer-term nutrients kick in

      B-vitamins, zinc and magnesium build up to optimal levels. Many customers report this is when “background” focus feels more consistent — not just on dose days.

    • EXAM WEEK

      Steady, familiar routine

      By now you know exactly how it fits your day. Keep the same routine into exam week — familiarity beats novelty. If it isn’t for you, return any unfinished pack within 365 days for a full refund.

    Three questions — we’ll suggest a formula

    No data collected. The recommendation appears below the third answer.

    Question 1 of 3

    1. What are you most hoping to support?

    Question 2 of 3

    2. How would you describe a typical revision week?

    Question 3 of 3

    3. How experienced are you with focus supplements?

    Plant-powered focus for exam season

    Rated 4.74 out of 5 stars 4.74/5 from 6,020+ verified reviews

    From £18 · 365-day money-back guarantee · Made in Scotland

    Plant-powered focus
    for exam season     See the formulas