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Supplement Facts & Directions

Supplement Facts

Serving Size: 500 milligrams
Servings Per Container: Varies
Amount Per Serving % Daily Value*
L-Tryptophan 500mg

* Percent Daily Values are based on a 2,000 calorie diet.
† Daily Value Not Established
‡ These supplement facts may vary from the product you receive.    Please call for exact numbers.

Other Ingredients: None


Free of:  Soy, Dairy, Yeast, Gluten, & Additives.

Directions:  As a dietary supplement, take 500 mg (3/8 tsp) up to three times a day, or as directed by physician.

Warning: If you are pregnant, nursing, taking any medications or have any medical condition consult your physician before use. May interact with medications such as anti-depressants. Keep out of reach of children. Store in a cool, dark & dry place.


Product Details

You are buying L-tryptophan which is an essential amino acid made from proteins during digestion by the action of proteolytic enzymes. Tryptophan can only be obtained through food or supplementation and cannot be produced within the body.
Tryptophan is a precursor and a vital element for neurotransmitters serotonin and melatonin. These chemical messengers transport nerve impulses from one cell to another. The brain will not function properly without sufficient amounts of these neurotransmitters.
Tryptophan is needed to produce serotonin in the human body. Serotonin is one of the key brain chemicals involved in regulating mood. Serotonin levels play a key role in the regulation of anxiety, depression, appetite, sexual behavior and aggression.
This amino acid is present in high levels in turkey meat and has long been said to be the reason people get sleepy after a big turkey dinner. Actually, tryptophan is also present in high levels in other meats too.

Tested by Accredited 3rd Party Labs

PureBulk's supplements are tested by accredited third party labs in the USA to ensure their identity, purity and potency. To receive a copy of these test results or any other PureBulk supplement please fill out the COA request form found here.

*NOTE: 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.