Amplifies alpha brain waves which heighten creativity and alertness

Regulates mood and relieves anxiety and stress

Improves cognitive function and learning ability

Can help the body relax without becoming drowsy and improves sleep quality

Fun Facts

  • L-Theanine is an amino acid and one of the main active ingredients found in green and black tea.

  • When combined with caffeine it heightens focus, energy, and improves mental endurance to even higher levels.

  • Widely used in treating attention deficit-hyperactivity disorder (ADHD).

  • Improves mental performance and your ability to multi-task.


  • Since its discovery in the 1940’s it has been thoroughly studied on humans and has been found to have brain-boosting, calming and anti-anxiety effects.

  • When paired with caffeine, L-theanine has been proved to improve focus and concentration while reducing the ‘jittery’ effects of caffeine.

  • Reduces heart rate, helping with stress and anxiety, and improves sleep quality.




Combine With

50-100mg of caffeine (about one cup of coffee)

When & How

100-400mg (experiment and monitor)

With coffee or caffeine in the morning


Consult your physician if you are taking antidepressants, medication for high blood pressure, or any neurally-active medications

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 Q & A

How does L-theanine affect your brain?

L-theanine has been shown to affect your brain in numerous ways, such as amplifying your alpha brain waves which heighten creativity and alertness. By boosting your GABA, serotonin, and dopamine levels it has also been shown to increase focus, regulate your mood, and has a calming effect.

How long does L-theanine take to work?

The time it takes for your body to digest L-Theanine is entirely based on your body.

Is L-theanine safe to take daily?
  • Yes, L-Theanine is safe to take daily. If you are at all worried about its eects on your body, please consult your physician before introducing it into your daily routine.

How does L-theanine work for anxiety?

L-theanine works for anxiety by raising levels of ‘feel good’ hormones such as serotonin and dopamine, while reducing heart rate. This leaves you feeling relaxed and less anxious.

What are the side effects of L-theanine?

While no studies have come up with any negative, conclusive side eects of L-Theanine, it is advised to consult with a physician before combining the supplement with certain medications. This includes, but is not limited to, medications that lower blood pressure and supplements that contain caeine.

  • Breus, Michael. “What You Need to Know About L-Theanine.” Psychology Today, Sussex Publishers, 2017, www.psychologytoday.com/us/blog/sleep-newzzz/201708/what-you- need-know-about-l-theanine.

    “Caeine Overdose: Symptoms, Side Eects, and Treatment.” Healthline, Healthline Media, www.healthline.com/health/caeine- overdose.

    Foxe, John J, et al. “Assessing the Eects of Caeine and Theanine on the Maintenance of Vigilance during a Sustained Attention Task.” Neuropharmacology, U.S. National Library of Medicine, June 2012, www.ncbi.nlm.nih.gov/pubmed/22326943.

    “Journal of Nutrition & Intermediary Metabolism.” Elsevier, www.jnimonline.com/article/S2352-3859(15)00313-8/fulltext.

    Kellett, Jane, et al. “l-Theanine as a Functional Food Additive: Its Role in Disease Prevention and Health Promotion.” MDPI, Multidisciplinary Digital Publishing Institute, 30 May 2016, www.mdpi.com/2306- 5710/2/2/13/htm.

    Ota, Miho, et al. “Eect of l-Theanine on Glutamatergic Function in Patients with Schizophrenia | Acta Neuropsychiatrica.” Cambridge Core, Cambridge University Press, 21 Apr. 2015, www.cambridge.org/core/journals/acta- neuropsychiatrica/article/eect-of-l-theanine-on-glutamatergic- function-in-patients-with- schizophrenia/4C52908DEEDE7C938EA5110D13AA2BA2.

    Sarris, Jerome, et al. “L-Theanine in the Adjunctive Treatment of Generalized Anxiety Disorder: A Double-Blind, Randomised, Placebo- Controlled Trial.” Journal of Psychiatric Research, U.S. National Library of Medicine, Mar. 2019, www.ncbi.nlm.nih.gov/pubmed/30580081.

    Sissons, Claire. “L-Theanine: Benets, Risks, Sources, and Dosage.” Medical News Today, MediLexicon International, 2019, www.medicalnewstoday.com/articles/324120.php.

    Wislon, Debra Rose. “L-Theanine: Dosage, Benets, and Side Eects.” Healthline, Healthline Media, 2016, www.healthline.com/health/l- theanine.

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