L-Theanine 200mg Capsules

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L-Theanine capsules (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 Capsules 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 capsule 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 capsules 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.
December 19, 2023
Donna Paduano
L-Theanine 200mg Capsules

Been using this LiftMode product for years. The quality is terrific, and I will continue to purchase this only from LiftMode. Waiting for the 300 count bottle to be back in stock.

August 9, 2023
L-Theanine 200mg Capsules

Very nice!

July 22, 2023
Donna Paduano
L-Theanine 200mg Capsules

I and my family members have been using this product for years. We have seen a wonderful improvement in memory and temperament. Unfortunately, it was out of stock for quite a while, and only the smaller size bottle of 70 is available. I purchased 14 bottles of 70 for my 93 year old mother, me and my husband, and the cost was more than twice as much as the 300 count bottle I normally purchase. The product is great, but please make the larger sizes available soon!

February 25, 2023
Florence Oswald
L-Theanine 200mg Capsules

Absolutely the best L-theanine!

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

Supplement Facts

Serving size: 1 capsule
Servings per container:
Amount per serving: % DV


200 mg
LiftMode offers a variety of unit sizes of HPLC-tested L-Theanine 200mg Capsules, including a a 7ct unit, a 15ct unit, a 70ct unit, a 150ct unit and a 300ct unit. Our L-Theanine 200mg Capsules 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
HPLC Lab tested
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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.