Exam Season: Supplements To Support Brain Power, Sleep And Stress

Key nutrients to hack sleep, stress and cognitive performance.

Exam Season: Supplements To Support Brain Power, Sleep And Stress photo

Exams – the very word strikes fear into the heart of the best of us! Whether it’s handling revision, managing nerves or mastering subject topics and techniques, exam season makes demands on the brain and nervous system that go way beyond everyday requirements. Exam days themselves require sustained bursts of peak performance in concentration, memory, evaluation, problem-solving, reasoning, decision-making, organisation and presentation.

How do you support good physiological function in these areas to give yourself the best chance of exam success? In this article we look at some fundamental supplements that might help keep stress at bay, optimise sleep and keep the brain running well. We also explore the exciting world of nootropics – supplements that are increasingly showing promise in enhancing cognitive capabilities.

1. Power to the Brain!

Nutrients for brain power: what are the essentials?

The brain is the most metabolically active organ in the body, using 20% of our energy.1 A range of vitamins, minerals and other nutrients act as chemical catalysts to support these metabolic processes and provide the building blocks for the brain and its messenger system of nerves, hormones and neurotransmitters. A good supply of nutrients is therefore essential for effective cognitive processing, including learning and recall. Research suggests that B vitamins, vitamin D, fatty acids and amino acids (proteins) are the key nutrients that work in synergy to keep this complex system running optimally.2

Let’s take a closer look at these four essentials:

B Vitamins

The eight water-soluble B vitamins come into play at multiple points in the metabolic processes of the brain and nervous system. The B vitamins are so important that each one has its own doorway into the brain across the blood-brain barrier!3 Look out in particular for these brain superstars:

  • Vitamin B12 – adequate levels of this vitamin are crucial for maintaining cognitive processing power and regulating the nervous system.4 Vitamin B12 supports the production of neurotransmitters, accurate cell replication and the integrity of the myelin sheath that surrounds nerves. Testing of your serum B12 levels is a useful place to start when supplementing this important vitamin, especially for vegans and vegetarians as vitamin B12 is only available in animal-derived foods. One of the most bioavailable vitamin B12 supplements is hydroxocobalamin.5
  • Vitamin B9 (folate) – vitamins B9 and B12 work synergistically to process homocysteine, a neurotoxic and excitatory chemical produced as a by-product of metabolism (6). Sufficient folate intake is therefore needed to keep homocysteine at safe levels for the brain.2 Look for supplements containing the bioavailable “folate” rather than “folic acid”.7

Vitamin D3

Vitamin D has antioxidant and anti-inflammatory effects in the brain, protecting it from everyday damage (8). Research also suggests that vitamin D is:

  • Vital for maintaining signalling pathways used in memory and cognition.2
  • Stimulates the growth of neurites, the sites of growth on brain cells (neurons).9
  • Regulates nerve growth factor, the substance needed for survival of neurons in the hippocampus and brain cortex,9
  • Associated with larger brain volume and healthy white matter.2
  • Essential for clearance of amyloid, the protein substance found in the brain in Alzheimer’s disease,8

Essential fatty acids

Sixty percent of the brain is made up of fat, underlining the importance of maintaining a good supply of appropriate fatty acids for the brain’s maintenance and repair.10 Two kinds of fatty acid have attracted the most attention for their use as supplements to support good brain and nervous system function:

  • Omega-3 oils – derived from marine sources, these long-chain fatty acids are incorporated in cell membranes and, in particular, the sheaths surrounding nerve cells (11). The quality of neuronal membranes maintains brain processing speed, regulates inflammation levels and protects the brain as it ages (12). Look for supplements providing krill oil, fish oil, fish liver oil or, especially useful for vegetarians and vegans, algal oil.
  • Phosphatidyl serine is a fat-soluble amino acid found in nerve cell membranes and the myelin sheath that envelopes nerves. It is critical to brain function and neurotransmission – the brain’s communication system. While phosphatidylserine is made within the body, this process can deteriorate as we age (13). Taken as a supplement, phosphatidylserine may therefore help preserve memory and cognitive function: dietary phosphatidyl serine crosses the blood-brain barrier to support memory formation and consolidation, learning, recall, concentration, problem-solving, reflexes and language skills (14).

Amino acids (proteins)

Amino acids provide the building blocks for proteins in the body and in food. The brain’s key messaging chemicals, neurotransmitters, are built from amino acids so it is not surprising that research finds a good intake of a range of these building blocks can support effective brain function.15 Key amino acids for neurotransmitter synthesis include tyrosine, tryptophan, histidine and arginine. A small study found that a supplement of seven amino acids supported improved cognitive flexibility and attention,16 – these were leucine, phenylalanine, isoleucine, histidine, lysine, valine and tryptophan. In addition to providing the raw materials for neurotransmitters, these proteins are thought to support direct maintenance and repair of the brain as well as inhibit the entry of neurotoxic substances.16

Nutrients for brain power: can we supercharge the brain?

Here comes the exciting part! Once we have the essential nutrients in place for normal cognitive function, what more can we do to boost the brain for optimal exam performance? A fast-moving field of research centres on the possibilities offered by herbs and other edible plant extracts that could enhance brain power: so-called “nootropics”. As this set of supplements can contain potent herbal extracts, it’s important to consult your medical or functional practitioner first. With this in mind, let’s take a look at some of the key up-and-coming brain supporters that might improve concentration, learning, memory and recall.

Bacopa Monnieri

Also known as Brahmi and nicknamed “herb of grace”,17 this plant has a long history of traditional use in Ayurvedic medicine for enhancing memory. It is rich in flavonoids, the plant compounds that appear to regulate brain and nervous system inflammation, support the brain’s signalling pathways and improve blood flow to the brain. Bacopa monnieri has performed well to improve language, learning and memory in modern research studies. A 2022 review of nootropic botanicals found that Bacopa monnieri was the plant compound with the biggest effects on memory and learning.18 Another recent study found that Bacopa monnieri could improve higher cognitive processes such as learning rate, memory consolidation and speed of visual information processing.18

Ginkgo biloba (also known as gingko biloba)

Extracts from the leaves of this Chinese plant, known as the “memory plant” and “the world’s oldest living tree” are thought to improve memory-related cognition, including working memory and memory consolidation.18 Studies have found ginkgo biloba may improve cognitive function by dilating blood vessels and boosting the flow of oxygen and nutrients to the brain. The herb also appears to have antioxidant effects, protecting brain and nerve cells from environmental damage.20 A study of young, healthy adults found faster information processing in working memory after taking ginkgo biloba for 30 days.19


Ashwagandha is another plant whose roots, leaves and stem have a long history of use in Ayurvedic medicine to support cognition and memory. In recent studies, ashwagandha root extract improved various aspects of learning and memory, including in elderly people with mild cognitive impairment.21


Part of the mint family of plants, sage has been detailed in traditional medical books for its potential to enhance brain power.19 Sage extracts appear to have ‘cholinergic’ properties, meaning that they can boost the efficiency of the neurotransmitter acetylcholine and improve attention, memory and learning.22 A 2021 study found significant benefits in working memory and accuracy in tests soon after people were given sage extracts.23 Greater improvements were seen after 29 days of supplementation, suggesting that the extracts have a cumulative effect.


Rich in flavonoids, cocoa appears to increase blood flow within the brain and improve other aspects of metabolic health such as insulin sensitivity that can result in better cognitive performance.24,25

Fruit extracts

Many fruits – including berries, grapes and citrus fruits – are known for their anti-inflammatory and antioxidant effects.26 Concentrated extracts may boost the flavonoid content and potential nootropic effects of fruits.27,28 Look out for:

  • Tart cherry for improvements in focus and cognitive function, as well as regulation of sleep cycles. In a trial, Montmorency tart cherry juice improved memory and attention in older adults after 12 weeks.29
  • Blueberry extracts, rich in anti-inflammatory and antioxidant flavonoids known as anthocyanins, may improve short- and long-term memory, as well as spatial memory.30
  • Haskap berry, another anthocyanin-rich fruit, improved memory in older adults and is thought to dilate blood vessels for better flow of oxygen and nutrients to the brain.31

2. Stress-busting supplements that might also help you sleep

Supercharging your brain power is not the only factor to consider when preparing for exams. While short-term stress is a natural response to challenges and might actually help learning, chronic stress can interfere with exam performance by:32

  • Dysregulating hormones and neurotransmitters, which can then impair brain performance, including concentration, memory retrieval and reasoning.32,33
  • Depleting nutrient levels, which risks depriving the brain of the chemical co-factors it needs to function well during revision and exams.34
  • Compromising sleep, which in itself can worsen exam performance.35,36

Let’s look at some key supplements that can help with stress levels and sleep during exam season:


Magnesium levels in the body have long been thought to affect anxiety and mood, primarily through magnesium’s role in regulating the stress response via the hypothalamic-pituitary-adrenal axis.37 Magnesium might also inhibit glutamate, the excitatory neurotransmitter associated with anxiety, fear and panic. Stressful events such as exams can lead to increased excretion of magnesium, potentially worsening feelings of anxiety by dysregulating stress hormones (38). Supplemental magnesium may therefore help to keep stress levels under control.39 Look for a mix of magnesium types such as magnesium taurate, magnesium malate and magnesium citrate.40

B vitamins

The B vitamins, discussed above to support normal brain function, also play an important role in the regulation of the body’s stress response. Look out in particular for the following:

  • Vitamin B5 (pantothenic acid) supports the synthesis and metabolism of cortisol and the production of calming neurotransmitters such as serotonin.41
  • Vitamin B6 also supports the production of the calming neurotransmitters serotonin and GABA.42
  • Studies have found that supplemental magnesium and vitamin B6 work well together to alleviate stress, so teaming these two stress-busting nutrients could be a winning combination for exam season.39,42


Rhodiola is a herb that has a history of use down the centuries to reduce stress and anxiety.43 Studies have suggested that extracts of Rhodiola rosea:

  • Help with mood, cognition, fatigue, anxiety and stress after three days of use.44
  • Result in lower stress levels after 14 days of use.45
  • Bring immediate improvements in the capacity to cope with stress.46
  • Can combat insomnia.47

Green tea

In studies, participants have reported improved relaxation, mood and anxiety after taking green tea extracts.48 The active constituents of green tea include:

  • Catechins – flavonoids that have shown multiple benefits for cognition in conditions of stress.49
  • L-theanine – an amino acid that can relieve stress. A study of healthy adults found a reported reduction in stress one hour after taking an l-theanine-enriched drink before a stressful cognitive test. Researchers found participants had lower salivary levels of the stress hormone cortisol three hours after the drink.50

One study found significant improvements in stress levels with a combination of green tea, magnesium and rhodiola.51


Ashwagandha, already discussed above to support cognitive function, is also used in traditional medicine to help with stress.21 Studies show:

  • A reduction in cortisol and in perceived stress levels.18
  • Improved quantity and quality of sleep.52


Passionflower (Passiflora incarnata) has a long history of use in South America for promoting sleep. Recent studies have confirmed that flavonoids in the leaves and fruit can be effective to:

  • Relieve insomnia by increasing blood levels of the sleep hormone melatonin.53
  • Reduce anxiety and irritability by modulating the brain’s sensitivity to the GABA neurotransmitter.54,55

Key takeaways for how to cope with exam season

If you’re looking for some extra nutritional help to cope with exam season, start by asking yourself where you might get the best improvements.

Firstly, have you got the basics right? If your brain is to work as it should, it will need an adequate intake of the nutrients that support normal cognitive function. Consider:

  • B vitamins
  • Vitamin D
  • Fatty acids
  • Amino acids

Secondly, are you looking for a cognitive boost? Check out the plant extracts that could help your brain to go ‘above and beyond’ – the nootropics – (taking care to consult your medical or functional practitioner in case these powerful herbal concentrates are not suitable for you or your medications):

  • Bacopa monnieri
  • Gingko biloba
  • Ashwagandha
  • Sage
  • Cocoa
  • Fruit extracts

Thirdly, is stress or anxiety likely to disrupt your sleep or interfere with your exam performance? Consider these calming supplements:

  • Magnesium
  • B vitamins
  • Rhodiola
  • Green tea
  • Ashwagandha
  • Passionflower

Here’s to a calm and successful exam season!

  1. Raichle ME. Two views of brain function. Trends Cogn Sci. 2010 Apr;14(4):180–90.
  2. Beydoun MA, Shaked D, Hossain S, Beydoun HA, Katzel LI, Davatzikos C, et al. Vitamin D, Folate, and Cobalamin Serum Concentrations Are Related to Brain Volume and White Matter Integrity in Urban Adults. Front Aging Neurosci. 2020 May 25;12:140.
  3. Kennedy DO. B Vitamins and the Brain: Mechanisms, Dose and Efficacy--A Review. Nutrients. 2016 Jan 27;8(2):68.
  4. Smith AD, Refsum H. Homocysteine, B Vitamins, and Cognitive Impairment. http://dx.doi.org/101146/annurev-nutr-071715-050947. 2016 Jul 18;36:211–39.
  5. Greibe E, Nymark O, Fedosov SN, Heegaard CW, Nexo E. Differences in Tissue Distribution of Cyano−B12 and Hydroxo−B12 One Week after Oral Intake: An Experimental Study in Male Wistar Rats. Nutrients. 2018 Oct 12;10(10).
  6. Froese DS, Fowler B, Baumgartner MR. Vitamin B 12 , folate, and the methionine remethylation cycle-biochemistry, pathways, and regulation. J Inherit Metab Dis. 2019 Jul 1;42(4):673–85.
  7. Ferrazzi E, Tiso G, Di Martino D. Folic acid versus 5- methyl tetrahydrofolate supplementation in pregnancy. Eur J Obstet Gynecol Reprod Biol. 2020 Oct 1;253:312–9.
  8. Miller BJ, Whisner CM, Johnston CS. Vitamin D Supplementation Appears to Increase Plasma Aβ40 in Vitamin D Insufficient Older Adults: A Pilot Randomized Controlled Trial. J Alzheimers Dis. 2016;52(3):843–7.
  9. Anjum I, Jaffery SS, Fayyaz M, Samoo Z, Anjum S. The Role of Vitamin D in Brain Health: A Mini Literature Review. Cureus. 2018 Jul 10;10(7).
  10. Chang CY, Ke DS, Chen JY. Essential fatty acids and human brain. Acta Neurol Taiwan. 2009 Dec;18(4):231–41.
  11. Denis I, Potier B, Heberden C, Vancassel S. Omega-3 polyunsaturated fatty acids and brain aging. Curr Opin Clin Nutr Metab Care. 2015 Mar 13;18(2):139–46.
  12. Dyall SC. Long-chain omega-3 fatty acids and the brain: a review of the independent and shared effects of EPA, DPA and DHA. Front Aging Neurosci. 2015;7(APR).
  13. Skowronska-Krawczyk D, Budin I. Aging membranes: Unexplored functions for lipids in the lifespan of the central nervous system. Exp Gerontol. 2020 Mar 1;131.
  14. Glade MJ, Smith K. Phosphatidylserine and the human brain. Nutrition. 2015 Jun 1;31(6):781–6.
  15. Glenn JM, Madero EN, Bott NT. Dietary Protein and Amino Acid Intake: Links to the Maintenance of Cognitive Health. Nutrients. 2019 Jun 1;11(6).
  16. Suzuki H, Yamashiro D, Ogawa S, Kobayashi M, Cho D, Iizuka A, et al. Intake of Seven Essential Amino Acids Improves Cognitive Function and Psychological and Social Function in Middle-Aged and Older Adults: A Double-Blind, Randomized, Placebo-Controlled Trial. Front Nutr. 2020 Nov 25;7:240.
  17. Bhardwaj P, Kumar Jain C, Mathur A. Comparative analysis of saponins, flavonoids, phenolics and antioxidant activities of field acclimatized and in vitro propagated Bacopa monnieri (L.) Pennell from different locations in India. Indian J Exp Biol. 2019;57:259–68.
  18. Lorca C, Mulet M, Arévalo-Caro C, Sanchez MÁ, Perez A, Perrino M, et al. Plant-derived nootropics and human cognition: A systematic review. Crit Rev Food Sci Nutr. 2022;
  19. Roe AL, Venkataraman A. The Safety and Efficacy of Botanicals with Nootropic Effects. Curr Neuropharmacol. 2021 Jul 28;19(9):1442.
  20. Stough C, Clarke J, Lloyd J, Nathan PJ. Neuropsychological changes after 30-day Ginkgo biloba administration in healthy participants. Int J Neuropsychopharmacol. 2001;4(2):131–4.
  21. Choudhary D, Bhattacharyya S, Bose S. Efficacy and Safety of Ashwagandha (Withania somnifera (L.) Dunal) Root Extract in Improving Memory and Cognitive Functions. https://doi.org/101080/1939021120171284970. 2017 Nov 2;14(6):599–612.
  22. Lopresti AL. Salvia (Sage): A Review of its Potential Cognitive-Enhancing and Protective Effects. Drugs R D. 2017 Mar 1;17(1):53–64.
  23. Wightman EL, Jackson PA, Spittlehouse B, Heffernan T, Guillemet D, Kennedy DO. The acute and chronic cognitive effects of a sage extract: A randomized, placebo controlled study in healthy humans. Nutrients. 2021 Jan 1;13(1):1–21.
  24. Lamport DJ, Pal D, Moutsiana C, Field DT, Williams CM, Spencer JPE, et al. The effect of flavanol-rich cocoa on cerebral perfusion in healthy older adults during conscious resting state: a placebo controlled, crossover, acute trial. Psychopharmacology (Berl). 2015 Sep 14;232(17):3227–34.
  25. Mastroiacovo D, Kwik-Uribe C, Grassi D, Necozione S, Raffaele A, Pistacchio L, et al. Cocoa flavanol consumption improves cognitive function, blood pressure control, and metabolic profile in elderly subjects: the Cocoa, Cognition, and Aging (CoCoA) Study--a randomized controlled trial. Am J Clin Nutr. 2015 Mar 1;101(3):538–48.
  26. Tan SJ, Ismail IS. Potency of Selected Berries, Grapes, and Citrus Fruit as Neuroprotective Agents. Evidence-based Complement Altern Med. 2020;2020.
  27. Ayaz M, Sadiq A, Junaid M, Ullah F, Ovais M, Ullah I, et al. Flavonoids as prospective neuroprotectants and their therapeutic propensity in aging associated neurological disorders. Front Aging Neurosci. 2019;11(JUN):155.
  28. Onaolapo AY, Obelawo AY, Onaolapo OJ. Brain Ageing, Cognition and Diet: A Review of the Emerging Roles of Food-Based Nootropics in Mitigating Age-related Memory Decline. Curr Aging Sci. 2019 Mar 13;12(1):2–14.
  29. Chai SC, Jerusik J, Davis K, Wright RS, Zhang Z. Effect of Montmorency tart cherry juice on cognitive performance in older adults: a randomized controlled trial. Food Funct. 2019 Jul 1;10(7):4423–31.
  30. Travica N, D’Cunha NM, Naumovski N, Kent K, Mellor DD, Firth J, et al. The effect of blueberry interventions on cognitive performance and mood: A systematic review of randomized controlled trials. Brain Behav Immun. 2020 Mar 1;85:96–105.
  31. Bell L, Williams CM. A pilot dose–response study of the acute effects of haskap berry extract (Lonicera caerulea L.) on cognition, mood, and blood pressure in older adults. Eur J Nutr. 2019 Dec 1;58(8):3325–34.
  32. Vogel S, Schwabe L. Learning and memory under stress: implications for the classroom. NPJ Sci Learn. 2016 Dec;1(1).
  33. Lane A, McGrath J, Cleary E, Guerandel A, Malone KM. Worried, weary and worn out: mixed-method study of stress and well-being in final-year medical students. BMJ Open. 2020 Dec 10;10(12).
  34. Lopresti AL. The Effects of Psychological and Environmental Stress on Micronutrient Concentrations in the Body: A Review of the Evidence. Vol. 11, Advances in Nutrition. 2020.
  35. Nollet M, Wisden W, Franks NP. Sleep deprivation and stress: a reciprocal relationship. Interface Focus. 2020 Jun 6;10(3).
  36. Zeek ML, Savoie MJ, Song M, Kennemur LM, Qian J, Jungnickel PW, et al. Sleep Duration and Academic Performance Among Student Pharmacists. Am J Pharm Educ. 2015 Jul 25;79(5).
  37. Boyle NB, Lawton C, Dye L. The Effects of Magnesium Supplementation on Subjective Anxiety and Stress-A Systematic Review. Nutrients. 2017 Apr 26;9(5).
  38. Grases G, Pérez-Castello JA, Sanchis P, Casero A, Perelló J, Isern B, et al. Anxiety and stress among science students. Study of calcium and magnesium alterations. Magnes Res. 2006;19(2):102–6.
  39. Pouteau E, Kabir-Ahmadi M, Noah L, Mazur A, Dye L, Hellhammer J, et al. Superiority of magnesium and vitamin B6 over magnesium alone on severe stress in healthy adults with low magnesemia: A randomized, single-blind clinical trial. PLoS One. 2018 Dec 1;13(12):e0208454.
  40. Pardo MR, Garicano Vilar E, San Mauro Martín I, Camina Martín MA. Bioavailability of magnesium food supplements: A systematic review. Nutrition. 2021 Sep 1;89:111294.
  41. Hrubša M, Siatka T, Nejmanová I, Vopršalová M, Krčmová LK, Matoušová K, et al. Biological Properties of Vitamins of the B-Complex, Part 1: Vitamins B 1, B 2, B 3, and B 5. Nutrients. 2022 Feb 1;14(3).
  42. Noah L, Dye L, Bois De Fer B, Mazur A, Pickering G, Pouteau E. Effect of magnesium and vitamin B6 supplementation on mental health and quality of life in stressed healthy adults: Post-hoc analysis of a randomised controlled trial. Stress Heal. 2021 Dec 1;37(5):1000–9.
  43. Mattioli L, Funari C, Perfumi M. Effects of Rhodiola rosea L. extract on behavioural and physiological alterations induced by chronic mild stress in female rats. J Psychopharmacol. 2009 Mar;23(2):130–42.
  44. Edwards D, Heufelder A, Zimmermann A. Therapeutic effects and safety of Rhodiola rosea extract WS® 1375 in subjects with life-stress symptoms--results of an open-label study. Phytother Res. 2012;26(8):1220–5.
  45. Cropley M, Banks AP, Boyle J. The Effects of Rhodiola rosea L. Extract on Anxiety, Stress, Cognition and Other Mood Symptoms. Phytother Res. 2015 Dec 1;29(12):1934–9.
  46. Duncan MJ, Clarke ND. The Effect of Acute Rhodiola rosea Ingestion on Exercise Heart Rate, Substrate Utilisation, Mood State, and Perceptions of Exertion, Arousal, and Pleasure/Displeasure in Active Men . J Sports Med. 2014;2014:1–8.
  47. Hao YF, Luo T, Lu ZY, Shen CY, Jiang JG. Targets and underlying mechanisms related to the sedative and hypnotic activities of saponins from Rhodiola rosea L. (crassulaceae). Food Funct. 2021 Nov 7;12(21):10589–601.
  48. Hozawa A, Kuriyama S, Nakaya N, Ohmori-Matsuda K, Kakizaki M, Sone T, et al. Green tea consumption is associated with lower psychological distress in a general population: the Ohsaki Cohort 2006 Study. Am J Clin Nutr. 2009 Nov 1;90(5):1390–6.
  49. Musial C, Kuban-Jankowska A, Gorska-Ponikowska M. Beneficial Properties of Green Tea Catechins. Int J Mol Sci. 2020 Mar 1;21(5).
  50. White DJ, de Klerk S, Woods W, Gondalia S, Noonan C, Scholey AB. Anti-Stress, Behavioural and Magnetoencephalography Effects of an L-Theanine-Based Nutrient Drink: A Randomised, Double-Blind, Placebo-Controlled, Crossover Trial. Nutrients. 2016 Jan 19;8(1).
  51. Boyle NB, Billington J, Lawton C, Quadt F, Dye L. A combination of green tea, rhodiola, magnesium and B vitamins modulates brain activity and protects against the effects of induced social stress in healthy volunteers. Nutr Neurosci. 2021;
  52. Cheah KL, Norhayati MN, Yaacob LH, Rahman RA. Effect of Ashwagandha (Withania somnifera) extract on sleep: A systematic review and meta-analysis. PLoS One. 2021 Sep 1;16(9):e0257843.
  53. Kim GH, Kim Y, Yoon S, Kim SJ, Yi SS. Sleep‐inducing effect of Passiflora incarnata L. extract by single and repeated oral administration in rodent animals. Food Sci Nutr. 2020 Jan 1;8(1):557.
  54. Janda K, Wojtkowska K, Jakubczyk K, Antoniewicz J, Skonieczna-żydecka K. Passiflora incarnata in Neuropsychiatric Disorders-A Systematic Review. Nutrients. 2020 Dec 1;12(12):1–17.
  55. Fonseca LR d., Rodrigues R de A, Ramos A de S, Da Cruz JD, Ferreira JLP, Silva JR de A, et al. Herbal Medicinal Products from Passiflora for Anxiety: An Unexploited Potential. ScientificWorldJournal. 2020;2020.