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Buy Our L-Tryptophan Supplement


L-Tryptophan is an essential amino acid that cannot be produced by the human body and must be consumed in the diet. It is essential for protein synthesis and is a precursor to serotonin. It has the chemical formula C11H12N2O2 and a molecular mass of 204.229 g/mol.


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L-Tryptophan Reviews


L-Tryptophan Benefits and Uses


L-Tryptophan is an essential nutrient and amino acid that is used in the biosynthesis of proteins. It also serves as a chemical precursor to serotonin, melatonin and niacin. Key physiological processes that are dependent on L-Tryptophan include the synthesis of: proteins, kynurenine, serotonin, melatonin, tryptamine, and NADP.


Additionally, many people report benefits on mood, relaxation and focus when taking this supplement.


Where to Buy L-Tryptophan Online?


LiftMode offers a variety of unit sizes of L-Tryptophan, including a 5-gram sample, and a 100-gram (3.53 Oz) unit. Our L-Tryptophan supplement is guaranteed at a high purity of 99+%.


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-Tryptophan is known by a number of alternative names, including:



2-Amino-3-(1H-indol-3-yl)propanoic acid

Tryptophan or (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid




L-2-amino-3-(indole-3-yl) propionic acid




Scientific Consensus:


L-Tryptophan is an essential amino acid and is considered possibly safe for use at the recommended serving size. It has several interactions with medications, especially antidepressant drugs, and should be avoided by people using these types of medications.


L-Tryptophan may cause a number of side effects when used in excess, including upset stomach, nausea, vomiting, dry mouth, headaches, and sexual disturbances. Do not exceed the recommended serving size.


Warning: There is not enough research about the safety of L-Tryptophan for pregnant and breastfeeding women. Do not use this supplement if you have any underlying medical conditions.




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.


Store in a cool, dry place. Keep out of reach of children. 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.


buy l-tryptophan supplement


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.

Content Updated On: November 4, 2019




  • Richard, D. M., Dawes, M. A., Mathias, C. W., Acheson, A., Hill-Kapturczak, N., Dougherty, D. M. (2009).  L-Tryptophan: Basic Metabolic Functions, Behavioral Research and Therapeutic Indications. International Journal of Tryptophan Research : IJTR. 2:45-60.


  • Strasser, B., Gostner, J. M., Fuchs, D. (2016). Mood, food, and cognition: role of tryptophan and serotonin. Curr Opin Clin Nutr Metab Care. 19(1):55-61.


  • Jenkins, T. A., Nguyen, J. C. D., Polglaze, K. E., Bertrand, P. P. (2016). Influence of Tryptophan and Serotonin on Mood and Cognition with a Possible Role of the Gut-Brain Axis.” Nutrients. 2016;8(1):56.


  • Hartmann E, Spinweber CL “Sleep induced by L-tryptophan. Effect of dosages within the normal dietary intake.”, J Nerv Ment Dis. 1979 Aug;167(8):497-9.