L-Tryptophan Powder

Regular price $7.68
Regular price $9.61 Sale price $7.68
Unit Size: 5g

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.


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.

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

  • Tryptophan
  • 2-Amino-3-(1H-indol-3-yl)propanoic acid
  • Tryptophan or (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid
  • Trp
  • L-Triptofano
  • L-2-amino-3-(indole-3-yl) propionic acid
  • L-Tryptophane

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.

Instructions & Ingredients

Serving size is 500 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: 500mg Servings per container: 10
Amount per serving % DV
L-Tryptophan 500 mg
‡ Daily Value not established.

Where To Buy

LiftMode offers a variety of unit sizes of HPLC-tested L-Tryptophan Powder, including a a 5g unit, a 100g unit and a 1000g unit. Our L-Tryptophan Powder is of the highest quality.

Disclaimer & Other Info

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.

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.

Regular price $7.68
Regular price $9.61 Sale price $7.68
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  • L-Tryptophan


L-Tryptophan plays a role in mood, appetite, and restful sleep, and is used as a dietary supplement ingredient. L-Tryptophan is an essential amino acid that is necessary for the normal functioning of the central nervous system, and functions as a building block for numerous proteins that are produced in the body. - Uplifts Mood - Essential Amino Acid - Promotes Healthy Sleep

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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.