L-Theanine Powder

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L-Theanine powder (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.

L-Theanine Powder 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.

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

  • Theanine
  • 3081-61-6
  • Theanin
  • N-Ethyl-L-glutamine
  • (S)-2-Amino-5-(ethylamino)-5-oxopentanoic acid
  • N5-Ethyl-L-glutamine
  • L-gamma-Glutamylethylamide
  • N-gamma-Ethyl-L-glutamine
  • N(5)-ethyl-L-glutamine

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.

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The statements on this page have not been evaluated by the FDA. The products on this page are not intended to diagnose, treat, cure, or prevent any disease.
August 9, 2023
L-Theanine Powder

Very nice!

March 28, 2023
Gary Bridgham
L-Theanine Powder

Good 👍 👍👍

February 20, 2023
L-Theanine Powder

L-Theanine is useful and helpful for giving a mild relaxing effect.

January 22, 2023
L-Theanine Powder

This is real deal! Effective every time. Service always good.

Serving size is 200 mg. As a dietary supplement, take 1-2 servings up to 2 times per day. Please start with the lowest suggested single serving quantity to assess response.

Supplement Facts

Serving size: 200mg
Servings per container:
Amount per serving: % DV


200 mg
LiftMode offers a variety of unit sizes of HPLC-tested L-Theanine Powder, including a a 50g unit, a 1000g unit, a 100g unit and a 5g unit. Our L-Theanine Powder is of the highest quality.
Store securely in a dry cool location away from direct sunlight. Keep out of reach of children and pets. Do not take this or any other supplement, and instead consult doctor about use, if you are under the age of 18, pregnant or breastfeeding, taking prescription or OTC / nonprescription drugs, or if you have any known or suspected medical conditions. Do not use if product safety seal was damaged or missing upon receipt.
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Free from additives and fillers
Gluten Free
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Science backed

Scientifically Tailored Ingredients

L-Theanine is a naturally occurring nutrient found in tea, and is used as an ingredient in dietary supplement products.

Studies suggest that L-Theanine may help reduce mental and physical stress, improve cognition and boost mood. L-Theanine is unique in supporting a calm mood while at the same time enhancing a sense of clarity and focus.

– Reduces Stress
– Boosts Cognition
– Calming

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.