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Buy Our L-Theanine Supplement


L-Theanine (also known as Theanine or 5-N-Ethyl-Glutamine) is a relatively rare phytochemical found in a few species of tea and mushrooms and is known for its synergistic effects with caffeine. It has a molar mass of 174.200 g/mol and the chemical formula C7H14N2O3.


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L-Theanine Reviews



L-Theanine Benefits and Uses


L-Theanine is very similar in structure to glutamine and GABA and is anecdotally consumed for its perceived antioxidant and relaxation effects, without promoting drowsiness. It has a strong synergistic effect with caffeine.


Chemically, L-Theanine is the enantiomer of D-Theanine, and it is a member of the glutamine derivatives class of compounds, which refers to compounds that contain glutamine or a derivative. Both L-Theanine and L-Glutamine are non-proteinogenic amino acids (not used to synthesize proteins). L-Theanine is water soluble and moderately acidic.


Where to Buy L-Theanine Online?


LiftMode offers a variety of unit sizes of L-Theanine, ranging from 50 grams (1.76 Oz) to 1000 grams (35.27 Oz). It is also available in a 200 mg L-Theanine capsule format, alone or in combination with caffeine (150 mg per capsule). LiftMode L-Theanine is guaranteed 99+% pure.

All our products ship with a certificate of analysis from 3rd-party independent laboratories, and all orders are covered by our 90-days refund/reshipment policy to ensure the highest quality.


Shipping restrictions: No shipping restrictions currently apply to this product and we are able to ship internationally. At checkout, the available shipping options for your location will be available.




L-Theanine supplements are also known by a few different names, including:






(S)-2-Amino-5-(ethylamino)-5-oxopentanoic acid






Scientific Consensus:

Supplementing with this product is likely to be safe, even at larger serving sizes. Doses of up to 400 mg have been safely administered for a period of 8 weeks. It is safe to take with caffeine. Theanine may cause mild side effects like headaches and drowsiness. 

DO NOT EXCEED THE RECOMMENDED SERVING SIZE. Use with caution. Do not use if pregnant or breastfeeding.



All dietary supplements have risks. Please ensure that you are familiar with the latest research on effects, side effects, benefits, and uses of a supplement before buying it. There are several good informative websites available for further research, such as and RXlist.


Store in a cool, dry place. Keep out of reach of children. Do not exceed the recommended serving size. If you have any underlying medical conditions or are taking any medication, please consult a medical professional before using this supplement. 


These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

l-theanine chemical structure


How We Research Our Content

Our content is written using meticulous research methods and claims are backed by links to scientific references, wherever possible. The author and editors of Liftmode's Research Team have strong academic backgrounds in microbiology, physiology, and biochemistry.

Medically Reviewed by: Dr. Karen Vieira, PhD in Biomedical Sciences

Content Updated On: October 4, 2019



  • Einöther, S. J., & Martens, V. E. (2013). Acute effects of tea consumption on attention and mood. American Journal of Clinical Nutrition, 98(6 Suppl):1700S-1708S. 
  • Theanine: Compound Summary for CID 439378. (2019). PubChem: US National Library of Medicine. [online]. Available at

  • Nobre, A.C., Rao, A., & Owen, G.N. (2008). L-theanine, a natural constituent in tea, and its effect on mental state. Asia Pac J Clin Nutr, 17 Suppl 1:167-8
  • Türközü, D., & Şanlier, N. (2015). L-theanine, unique amino acid of tea, and its metabolism, health effects, and safety. Critical Reviews in Food Science and Nutrition, 57(8), 1681-1687.  
  • Haskell, C.F., Kennedy, D.O., Milne, A.L., Wesnes, K.A., Scholey, A.B. (2008). The effects of L-theanine, caffeine and their combination on cognition and mood. Biol Psychol, 77(2):113-22.