Discover Claricalm, a dietary supplement formulated with L-theanine and GABA to boost focus, clarity, and concentration in teens and young adults.

L-theanine promotes relaxation without drowsiness, increasing alertness during mentally demanding tasks.

GABA, a brain neurotransmitter, alleviates stress and anxiety, enabling better concentration.

Key Benefits:

    • Enhances focus and concentration
    • Promotes relaxation without drowsiness
    • Supports healthy brain function
    • Reduces stress and anxiety

Claricalm is a safe and natural choice for parents who want to help their children achieve greater focus, clarity, and calmness. Claricalm is made with all-natural ingredients and is free from anything artificial. It is non-GMO, gluten-free, and suitable for vegetarians. Claricalm is available as an unflavoured powder that is added to any beverage, smoothie, or even your breakfast cereal.
Clean Formula


Fast Fact

Vitamin B6 is arguably the most important B vitamin for mental and brain health because it is critical for making neurotransmitters and can help minimize the harmful effects of stress, including: Psychological effects of stress: B6 helps produce calming neurotransmitters, including serotonin and GABA

Fast Fact

GABA is a natural chemical produced by the brain. It is a valuable anti-stress neurotransmitter. Calm helps you focus on what you need to do and get it done much more quickly. Calmness can also impact your creativity. Research suggests that our most creative ideas come in moments when we’re not actively focused or stressed.

Fast Fact

The stress response impairs our ability to think and function. Stress can result in poor concentration and memory because our minds are too worked up to focus. Trying to study when stressed is often unproductive, distracting, and can even provoke more stress.

Fast Fact

GABA is a natural chemical produced by the brain. It is a valuable anti-stress neurotransmitter. When we experience stress, the adrenal glands are triggered to produce hormones that trigger what we know as fight-or-flight responses. GABA counteracts these natural stimulants by relaxing the brain.

Fast Fact

Suntheanine is the trade name for Taiyo’s patented pure form of L-theanine. Suntheanine is not an extract of green tea but rather is produced via a patented process that mimics the natural process in green tea leaves, resulting in a 100% pure L-isomer-theanine.

Fast Fact

Clinical research suggests that 50 mg – 200 mg Suntheanine stimulates activity in the brain known as alpha waves, which are associated with a relaxed but alert mental state.

Fast Fact

GABA is considered an inhibitory neurotransmitter because it blocks, or inhibits, certain brain signals and decreases activity in your nervous system. When GABA attaches to a protein in your brain known as a GABA receptor, it produces a calming effect.




Sustained Energy

PalatinoseTM is a naturally sourced smart carbohydrate, providing full carbohydrate energy (4kcal/g) in a more balanced way thanks to its low-glycaemic profile.  By improving fat oxidation during physical activity, it prolongs energy supply. In addition, it is the first non-cariogenic carbohydrate, gentle on teeth.


PalatinoseTM (isomaltulose) is purely based on sucrose from sugar beet. It is 100 % vegan, kosher, halal and non-GMO.


Low GI carbohydrates like Palatinose™ have been found to improve attention and memory function with studies showing improved memory and mood 3 hours post consumption. 


Palatinose™ is a source of glucose and fructose to the body. Palatinose™ digests and absorbs slowly thus providing a steady supply of energy. The intake of slow digesting carbohydrates in children and adolescents has been found to benefit elements of cognitive function like memory, attention and mood.




Calm & Relaxed

L-Theanine is an amino acid which is found in tea leaves. L-Theanine promotes a calming and relaxing feeling without inducing drowsiness as well as improved focus, attention and clarity.

L-Theanine is most remarkable in its anti-anxiety potential during exposure to stressful conditions. L-Theanine works by stimulating alpha brain waves which are associated with an alert and relaxed state. L-Theanine may also promote healthy GABA levels



Gamma Amino Butyric Acid

Stress Resilience

GABA is a key calming neurotransmitter in the human nervous system that is also found in some foods. GABA acts to relax the nervous system by preventing overstimulation. GABA decreases stress-related beta waves and increases the production of alpha-waves in the brain which are related to lowered stress levels. 



86 reviews for ClariCalm

  1. Sindy Walkenshaw

    Purchased this product. Amazed!

  2. Angie S (verified owner)

    Excellent service and delivery. Excellent product information and very helpful staff

  3. Tirzah Kitshoff (verified owner)

    I am very impressed with this product. My son has been using it for the past week and all his teachers have commented on how chilled out he seems to be. Highly recommend to all moms who have an anxious/nervous teen.

  4. Tirzah

    My son’s teachers have commented on how much more calm and focused he is in class since starting the ClariCalm. Highly recommended!

  5. Rita (verified owner)

    Bought for my teens to keep stress levels to a minimum during exams.

  6. Lauren (verified owner)

    The ClariCalm is really helping my son to be more calm and focused at school. Very happy with the Bioteen range.

  7. Maaike Snyman (verified owner)

    My daughter, 8 years old, stuggles with sensory sensitivity, anxiety, focus and concentration. I tried this product out of desperation to find something to help her focus and it worked unbelievably well! Her concentration is better, she finishes her work, she is less stressed and anxious. Highly recommend!

  8. Barbara L

    My son says it really helps him focus and he says he stays calm during exams.

  9. Kirsten Morrison (verified owner)

    Started giving this to both my teens recently and it really works – they both report that they are calmer and more focused in class. They are starting exams soon and I am positive that it’s going to make a difference to their overall mood and ability to focus and concentrate.

  10. Lisa C (verified owner)

    My 10 year old son has ADHD and struggles with concentration. I have found that ClariCalm helps to keep him calm but alert and he is better able to concentrate in class. I love that the ingredients are all natural.

  11. Evette (verified owner)

    I am so amazed at the overall improvement in my sons mood and anxiety levels. So thankful for a quality product.

  12. Dianna Pappin (verified owner)

    My son has been on this for two weeks and has confirmed he is not feeling as nervous at school. It seems to help him focus more on school work!

  13. Tanya

    Cant wait to try this heard lots of good things about this product

  14. Tertia Willet

    My son says he feels so much calmer at school and doesn’t get anxious if his teacher raises her voice. Also feels more focused. He is 15.

  15. Lara A. (verified owner)

    Great product! My son’s overall mood has improved and he has been calmer, will definitely continue using Bioteen!

  16. Ansa (verified owner)

    We tried out ClariCalm when my daughter had to prepare for her recent music exam. Normally a very stressful time for her. My husband and I both observed a calmness which is unusual for her. We will continue using the product during stressful times.

  17. Natisha Ramthol (verified owner)

    It’s an amazing product, helps me focus.
    Product was delivered within two days once order was placed.

  18. Anca (verified owner)

    Excellent product, thank you Bioteen. My teens are feeling much more relaxed and calm since using ClariCalm.

  19. Pamela (verified owner)

    Impressed with the results so. My teen seems much more focused and calm since using this product.

  20. Samantha (verified owner)

    Immediately noticed a difference in my teenagers. They were more focused and calmer.

  21. Jorika (verified owner)

    My daughter is in Grade 10 and has auditory processing issues. Also, there is so much pressure on kids to perform these days. I bought my tub of ClariCalm 2 weeks ago. I’m very surprised with how calm she is during her test series. She is also answering questions in class which has never done before as she was too anxious.

  22. Melane Edwards (verified owner)

    Amazing product during exam time. ClariCalm really helped my daughter to be more calm and focused during her exam. Thank you Bioteen.

  23. Rialette De Villiers (verified owner)

    Great product. Used it with Learnergy, really helped my grade 12 daughter through her trial exams.

  24. Melony (verified owner)

    My 17 year old son in G11 was on neucon up until 3 weeks ago and I took him off as it gave him terrible moods. Diagnosed with ADHD at age 7. He started with Claricalm and Learnergy, It’s 2 weeks later and I can assure you he is really more focused and relaxed. These words coming directly from him – I wanted to cry.

  25. Deanne (verified owner)

    I have recently placed both my children 15 and 9 onto this and they both say they find it is helping them.

  26. Drienie (verified owner)

    My son is less nervous and sleeps better. Only regret is not finding Bioteen sooner.

  27. Theresa (verified owner)

    My sons teacher is very impressed. He is calmer in class, less fidgety and more focused.

  28. Parveen (verified owner)

    Excellent product – my daughter has been on it for a month and the difference is remarkable. Back here to buy the next one… can’t be without it especially with exams looming.

  29. Hazel (verified owner)

    I am glad I took the plunge and tried out ClariCalm for my son who’s in grade 9. He’s definitely been a lot more focused and calm for these exams. Thank you for a great product!

  30. Megan

    Easy to order and arrived quickly. No funny taste and dissolves quickly. My son doesn’t complain about any weird taste.

  31. Bernadette (verified owner)

    The other Bioteen products have helped my teen and I have started this one seeing an improvement already.

  32. Pat

    Claricalm has made such a difference in my children’s lives. They are able to focus more in class and they still have energy for classes at 11am.

  33. Amanda

    Claricalm is properly incredible. With Learnergy, the most wonderful combo. So proud that this is a local product.

  34. Kirsten Morrison (verified owner)

    I have been giving this to my sons in the morning before their exams and they say it does make them calmer and more focused when writing. Excellent for squashing those pre-exam nerves.

  35. Annere

    My daughter used to make careless errors in her tests and now with claricalm it is something of the past. Her marks improved by 20% in accounting.

  36. Sadiyya Patel (verified owner)

    I purchased this for my son who tends to be over anxious, especially during exam time. He says it helps him be more focused during his study sessions. I’m hoping that as time goes on, it will help his anxiety as well.

  37. Monique Swart (verified owner)

    Very impressed with the level of service and delivery, so much that I ended up buying even more products.
    This product is next level and as a mother this product is benefiting us as a family. I can see clear change in my daughter and I’m loving it.
    Thank you for making this available for people like me.

  38. Sanet Mader (verified owner)

    My son seems to be sleeping better and less anxious. His mood has improved and keeps calmer in tough situations that normal led to meltdowns. will keep using this product.

  39. Madlene Matthews (verified owner)

    My daughter used it for the first time through her exams at the end of 2023, and she was much more cool, calm & collected during all the test papers.

  40. Leanne Van Heerden (verified owner)

    What an amazing product. It did not take weeks to see a difference in my daughter but mere days. She was a more focused and relaxed person who started to enjoy her school. Highly recommend this product to everyone.

  41. Christa Eykelhof (verified owner)

    Very happy with this product. My twins are in high school and are coping so much better with the anxiety and pressures of senior phase, since they have started using this product.

  42. Titisi Johannes Moreki (verified owner)

    Delivery was quick as usuall. My child loves it course it tast good.

  43. Roxy (verified owner)

    My middle and youngest boys have definitely been calmer and more focused for their school work. They are completing tasks more efficiently and keeping up, which has also boosted confidence and lessened anxiety… win win!

  44. Suriyaganthy Munchund (verified owner)

    Claricalm helps my kids focus for their classes. Happy with the results.

  45. Karen Esreen (verified owner)

    I can see a change in both my kids. I so wish the grams could be a bit bigger.
    Thank you for this products

  46. Eloise Boning

    I absolutely love this product. Tried it myself and was amazed. Works for adults as well.

  47. Jorika Theron (verified owner)

    Beste besluit ooit. Ongelooflike produk met goeie resultate.

  48. Mercia Louw (verified owner)

    We are new to this product together with some more products, but kids are happy with the taste.

  49. Avril Williams

    Bioteen products are worth every cent…. best option for teens

  50. Sophia Black (verified owner)

    My teen is 14 and I combine it with Learnenergy.
    So far he is loving it and coping very well at his new High School.
    The ordering process is easy and the delivery is super quick.
    This is the 2nd time ordering and will continue.

  51. charmaine gray (verified owner)

    My son and i both use claricalm, since last year. While using it daily we dont even know about anxiety at all. I realised how effective this product is this week, when i ran out, because i forgot to reorder in time, and i now have the old feeling of anxiety running through my body everyday this week so far. Its a must have.

  52. Christa Van Tonder (verified owner)

    My son struggles to stay calm during exam time and adding the Claricalm this to his daily routine during this stressful time has made a huge difference in his marks.

  53. Tania Meyer (verified owner)

    I have a teenager son who is 14yrs old. My husband is working long hours because of the nature of his work on the mine. This was the best weekend ever. Short temper and irritation is something of the past. I will see the results when school is starting but at home it was only a pleasure!! I give a 5star with pleasure.

  54. Bronwyn Martins (verified owner)

    I have an active 13 year old who benefitted from claricalm to assist him with focus in the classroom. Amazing product, highly recommend.

  55. Melony Klaassen

    My son has ADHD and ClariCalm helps him alot. I am AMAZED!!!

  56. Isabelle Horn (verified owner)

    I have started drinking the claricalm with my sons and it is life changing! I would definitely recommend it!

  57. Alida Uys

    Ons super opgewonde gebruik vir 3 dae en daar is beslis n verandering en help om rustig te wees en slaap beter ….ons is baie baie tevrede dankie Bioteen

  58. Roxie (verified owner)

    So far from what I have seen even though it’s a few days my daughter is a lot more calmer.

  59. Michelle Eva (verified owner)

    Excellent service and delivery. Works well for my 11 year old daughter.

  60. Tania Meyer (verified owner)

    Fantastic. My whole family are different people. Why much less stress and irritated.
    Thank you so much. Their moods changed so much more for the best.

  61. Roxie Hansia

    Amazing product. My child is so calm and I use it with the clariboost and truly can see the difference in her behavior and school work.

  62. Lee-Ann Primmer (verified owner)

    Wow! Didn’t know it can work this fast! My child who was always moody and grumpy is showing huge positive changes since taking this – less than a week.

  63. Tania Meyer (verified owner)

    This is not the first order. I’ve ordered it before. Both my children as well as my husband are using it. They are so cool and calm. Amazing

  64. Chantel (verified owner)

    Excellent service and product. Can see a change in my son.

  65. Chantel Potgiter (verified owner)

    I use ClariCalm with Learnergy and must say he is not nervous at all.

  66. Tania Meyer (verified owner)

    Amazing product. Both my children and husband are taking it. No irritation or moody people in my house. Unbelievable. Thank you for your great product.

  67. Nadia (verified owner)

    I was very impressed with the delivery.
    I’ve received my order in 2 days after purchasing it….My son has started using the ClariCalm not long ago ,but I believe I will see results in due time .

  68. Chantel (verified owner)

    My son less nervous, sleeps better and more calmer. Very good product

  69. Lizelle (verified owner)

    Great product for anxious teens. Use it on a daily basis for my teen.

  70. Vicky Pretorius (verified owner)

    Very impressed with this product, I’ll definitely recommend it. Excellent service.

  71. Tania Meyer (verified owner)

    Amazing product. Everyone in my house are using it. No irritation, calm and patient people is what we are having. Thank you so much. Not my first or last order.

  72. Tania Meyer (verified owner)

    Amazing product. Everyone in my house hold is using it. What a pleasure.

  73. PJ van Niekerk (verified owner)

    My daughter, now 13, is using Claricalm for a month now. She does not drink any medication for concentration. She used to be very anxious before tests but we can really see the difference in her. She is calm and definitely more focused and does not make silly mistakes in tests anymore. I will definitely recommend

  74. Alta Cilliers (verified owner)

    First time trying this product. Trust it will be just as amazing as Learnergy.

  75. Carla Roux (verified owner)

    This is my son’s 3rd mont he is using it. I can see a big change. This is a great product, pls try it!

  76. Karin Koegelenberg (verified owner)

    We mix it with the multivitamin as a morning drink. Keeps my 13 year old calm and focused during the exams.

  77. Michelle van den Berg (verified owner)

    i have ordered this before for my daughter.
    She said it really works – 2nd order just placed.

  78. Tania Meyer (verified owner)

    Best product ever. My son is doing so much better during his Gr8 year. I can’t wait for this terms marks!! My eldest who is studying is also using it. She loves it as well. Thank you for your great product.

  79. Tania Meyer (verified owner)

    Great product. My Gr8 had a fantastic exam and all his teachers say they can see a difference.

  80. carla (verified owner)

    Very happy, fast delivery

  81. Tania Meyer (verified owner)

    Amazing product. Not my first purchase and definitely not my last. My children are different people. So calm, it is unbelievable. My teenager is a dream. Thank you for an amazing product

  82. Natasha Van Zyl

    This product was amazing with helping my son cope with exam stress. He was mych calmer and managed his emotions well.

    He used this with Leanenergy.

  83. Cindy Jacobs (verified owner)

    Awesome product…. My son been using it since February. Helps so much with his concentration and his mood….glove this

  84. Tania Meyer (verified owner)

    Best product ever. Everyone in my house is using it. Myself included. No irritation or short temper. My Gr8 teenager is no teenager anymore. Thank you so much.

  85. Tylene (verified owner)

    Dit help regtig vir my seuntjie met sy konsentrasie. En wanneer my oudste sulke mood uitbarstings het, drink hy net ‘n scoop em dan voel hy baie beter.

  86. Sinead van Eeden (verified owner)

    I have been using this for a few months now and it has helped so much for stressful moments and events. I love that it calms the nervous system but doesn’t take away from alertness/energy. I highly recommend it. 😄

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Being ‘in the zone’ when it comes to work or studying is literally one of the best feelings in the world. Basically, you become fully immersed in a feeling of energized focus, full involvement, and enjoyment in the process of the activity. At Bioteen, we’ve experienced this for ourselves and want to bring that feeling to everyone, especially teens who already have so much on their plate when it comes to their academic endeavors.


To help facilitate this ‘energized focus’ state of mind, we have developed a range of cognitive health supplements that use clinically proven ingredients to target the biological pathways that when given in the right doses, will have this effect. Including our study and calming booster: ClariCalm.


Let’s explore how the ingredients in Bioteen’s Claricalm improve energy supply to the brain, assist with neurotransmitter formation and enhance relaxing brainwave formation.


Energy supplying


Did you know that the brain uses 20-25% of an average adult’s energy, at rest? That is quite a lot of energy for an organ that only accounts for about 2% of your body weight. While there are a number of nutrients needed to maintain brain health, its preferred primary source of energy is glucose. As humans, we don’t really consume glucose as it is (even sugar is a combination of glucose and fructose), but rather depend on a varied diet that has a sufficient amount of carbohydrates that when broken down, provide the body with the much-needed glucose.


The supply of glucose (or glucose containing foods) can have an immediate and long-term effect on cognitive performance. Ideally you want a constant supply to prevent a blood sugar dip (1, 2). The reason why you want to avoid these dips is because the average teen’s brain can use up to 120g of glucose per day, which is about 30% higher than the amount an adult needs (3). Due to this higher rate of glucose metabolism, teen’s may be at a higher risk of the negative impacts of blood sugar dips (4) and so having a constant supply is crucial (1). In order to have this constant supply, we need to focus on foods that have a slow and steady release of glucose (aka low GI/ glycemic index choices). That’s why Palatinose™ is ideal, it provides a stable supply of glucose which is still completely absorbed, meaning it gives as much energy as other carbohydrate sources. Slow release carbs have been associated with an improved mood (because your teen isn’t feeling hangry)(4) as well as improved concentration and memory (5,6).


Neurotransmitter formation


Neurotransmitters are chemical signaling molecules that allow brain cells (or neurons) to communicate with each other which is vital for all the brain’s functions, including the ability to concentrate and learn. The types of neurotransmitters created can affect how a person feels and behaves.


For example:


  • Excitatory neurotransmitters excite the neuron, cursing it to fire its message
  • Inhibitory neurotransmitters inhibit/ relax the neuron, preventing it from firing


To reduce anxious feelings and get you into ‘the zone’, we need to downregulate some of the excitatory pathways and focus on increasing the inhibitory neurotransmitters. To do this, we have included L-Theanine (in the form of Suntheanine™), GABA and vitamin B in Bioteen’s ClariCalm.


Let’s start with L-theanine. It works in two main ways to calm you down, firstly it has a similar shape to the main excitatory neurotransmitter glutamate and because of this it can bind to glutamate receptors and block glutamate from exciting the neuron. Secondly, it is a precursor to GABA (or gamma aminobutyric acid) which is the main inhibitory neurotransmitter in the body accounting for about 40% of the inhibitory processing in the brain (7).


In addition to helping to calm you down, having enough glucose available (in the form of Palatinose™) is also important for the formation of the neurotransmitter acetylcholine, which has been found to be associated with improved concentration and memory (8).


Another very important nutrient that is a rate limiting cofactor in the synthesis of the neurotransmitters dopamine, serotonin and GABA is vitamin B6. Some research shows that even a mild deficiency of vitamin B6 can lead to a down regulation in the production of GABA (remembering that GABA is a calming neurotransmitter, and we want more of it to keep things cool and calm). In addition to this, vitamin B6 also plays a role in brain glucose regulation and as we have learned above, ensuring that the brain has enough energy is a crucial part of being able to concentrate and feel great (9).


Brain wave enhancement


Brain waves are electrical impulses that are classified into four groups according to their frequency: alpha, beta, theta, and delta waves (10).


Each wave type is associated with a different state of mind with alpha waves indicating reduced levels of anxiety and a state of wakeful relaxation whereas beta waves are associated with increased levels of stress and anxiety (9). It appears that Suntheanine® (L-theanine) has a direct effect on the brain, actively increasing alpha and decreasing beta wave activity. The huge benefit here is that while it relaxes the mind, it doesn’t cause drowsiness, which is the reason why it makes the perfect addition to a study aid.


In addition to the effects that L-theanine has on brain waves, oral GABA (which is also present in Bioteen’s ClariCalm) also appears to cross the blood brain barrier (BBB) to some degree. Here it directly exerts calming effects on the brain thus also affecting brain waves in a similar fashion (11). Some research shows that the stress protective effects of GABA can be seen in as little as 30 minutes (12), showing us that including GABA can be a quick and efficient way to bring on a state of calm, ideal for concentration.


The bottom line


The bottom line is that using the right nutraceuticals and ingredients can be a viable way to help your teen concentrate and learn more effectively, whilst remaining calm. We have highlighted these two specific ingredients for Bioteen’s ClariCalm booster because we believe that when used alone, they are useful, but together they are unstoppable.



  1. Jansen K, Tempes J, Drozdowska A, Gutmann M, Falkenstein M, Buyken A et al. Short-term effects of carbohydrates in glycemic index (GI) consumed at lunch on children’s cognitive function in a randomized crossover study. European Journal of Clinical Nutrition. 2020;74(5):757-764.
  2. Peters R, White D, Cleeland C, Scholey A. Fuel for Thought? A Systematic Review of Neuroimaging Studies into Glucose Enhancement of Cognitive Performance. Neuropsychology Review. 2020;30(2):234-250.
  3. Kuzawa C, Chugani H, Grossman L, Lipovich L, Muzik O, Hof P et al. Metabolic costs and evolutionary implications of human brain development. Proceedings of the National Academy of Sciences. 2014;111(36):13010-13015.
  4. Young H, Benton D. The effect of using isomaltulose (Palatinose™) to modulate the glycaemic properties of breakfast on the cognitive performance of children. European Journal of Nutrition. 2014;54(6):1013-1020.
  5. Micha R, Rogers P, Nelson M. Glycaemic index and glycaemic load of breakfast predict cognitive function and mood in school children: a randomised controlled trial. British Journal of Nutrition. 2011;106(10):1552-1561.
  6. Cooper S, Bandelow S, Nute M, Morris J, Nevill M. Breakfast glycaemic index and cognitive function in adolescent school children. British Journal of Nutrition. 2011;107(12):1823-1832.
  7. Sheffler Z, Reddy V, Pillarisetty L. Physiology, Neurotransmitters [Internet]. 2022 [cited 25 August 2022]. Available from:
  8. Kashimura, J., Nagai, Y. and Ebashi, T., 2003. The Effect of Palatinose on Mental Concentration in Humans. Journal of Nutritional Science and Vitaminology, 49(3), pp.214-216.
  9. Abdou A, Higashiguchi S, Horie K, Kim M, Hatta H, Yokogoshi H. Relaxation and immunity enhancement effects of γ-Aminobutyric acid (GABA) administration in humans. BioFactors. 2006;26(3):201-208.
  10. Rao T, Ozeki M, Juneja L. In Search of a Safe Natural Sleep Aid. Journal of the American College of Nutrition. 2015;34(5):436-447.
  11. Rao T, Ozeki M, Juneja L. In Search of a Safe Natural Sleep Aid. Journal of the American College of Nutrition. 2015;34(5):436-447.
  12. ​​Hepsomali P, Groeger JA, Nishihira J, Scholey A. Effects of oral gamma-aminobutyric acid (GABA) administration on stress and sleep in humans: A systematic review. Frontiers in Neuroscience. 2020;14.
  13. Hepsomali P, Groeger JA, Nishihira J, Scholey A. Effects of oral gamma-aminobutyric acid (GABA) administration on stress and sleep in humans: A systematic review. Frontiers in Neuroscience. 2020;14.
  14. Yoto A, Murao S, Motoki M, Yokoyama Y, Horie N, Takeshima K, et al. Oral intake of γ-aminobutyric acid affects mood and activities of central nervous system during stressed condition induced by mental tasks. Amino Acids. 2011;43(3):1331–7.


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