L-tryptophan is an essential amino acid; therefore, it is not synthesized by the body and must be obtained from the diet. In the brain, tryptophan is converted into serotonin, a neurotransmitter involved in feelings of well-being, calmness, personal security, and relaxation. It also plays a role in the regulation of appetite and synchronization of sleep patterns. Every lot of Protocol For Life Balance L-tryptophan is tested to be free of Peak E and microbial contamination. Encourages Positive Mood Supports Relaxation & Restful Sleep Dietary Considerations Wheat Free Dairy/ Milk Free Gluten Free Vegetarian Soy Free Yeast Free Vegan Egg Free Shellfish Free Non-GMO Fish Free Tree Nut Free Serving Size: 2 VCap Servings Per Container: 60 Amount Per Serving L-Tryptophan (free form) (2-amino-3-indolylpropanoic acid) (1,000 mg) 1 g Other Ingredients: Cellulose (capsule), Cellulose powder, Stearic Acid (vegetable source) Suggested Usage: As a dietary supplement, take 1-2 capsules twice daily on an empty stomach, with final dose at bedtime, or as directed by a health care practitioner. Caution/Interactions: Tryptophan supplements may interact with CNS depressants, antidepressants (SSRIs,MAOIs), and other serotonergic agents such as St. John's Wort and 5-HTP. Consult your healthcare practitioner if you are taking medications or herbs, are pregnant/nursing, or if you have a liver impairment. May cause drowsiness. Do not use with alcoholic beverages or while operating heavy machinery. Natural color variation may occur in this product. Do not eat freshness packet. Keep in bottle.