NOW Foods 5-HTP 50 mg - 90 CapsulesNow Foods 5-HTP, the intermediate metabolite between the amino acid L-tryptophan and serotonin, is extracted from the bean of an African plant (Griffonia simplicifolia). Now Foods 5-HTP (5-hydroxytryptophan) is a metabolite (a substance produced by metabolism) of the amino acid tryptophan. You may know tryptophan as the substance in turkey that makes you feel like taking a nap after Thanksgiving dinner. Now Foods 5-HTP is a direct precursor of the important inhibitory neurotransmitter serotonin, which is secreted in response to mood or emotion swings. Serotonin soothes and calms and brings about feelings of contentment. It is also the precursor to the antioxidant and sleep enhancer called melatonin, which is produced in the pineal gland by the conversion of serotonin.Neurotransmitter SupportNatural SourceSupports Positive MoodIs 5-HTP safe to take? The FDA has warned that it has found batches with impurities similar to the Japanese batches of tryptophan in 1980.5-HTP and tryptophan are not the same. 5-HTP is related to tryptophan, but is derived from a different source. The 1980 scare concerning the Japanese tryptophan was attributed to a large batch the Japanese produced that was contaminated during the fermentation and/or filtration process. The contaminant caused affected persons to develop symptoms of EMS (eosinophilia-myalgia syndrome). 5-HTP, unlike tryptophan, is now extracted from the seed of the Griffonia simplicifolia plant and is not produced via bacterial fermentation, virtually eliminating further occurrence of EMS. The contaminant believed to have caused the tryptophan contamination has not been identified as being present in 5-HTP.Does NOW check for Peak X contamination in the 5-HTP product?NOW 5-Hydroxytryptophan (5-HTP) is the highest quality >99% pure material available. The culprit in the tryptophan problem some years ago was supposedly due to a compound dubbed Peak X. NOW 5-HTP is Peak X free. NOW also requires total Impurities [e.g. the synthetic D-form, determined by HPLC] to be not more than 0.5%, Chloride less than 100 parts per million, Tryptophan not more than 0.05%, and Serotonin has to be absent.Suggested UseAs a dietary supplement, take 1 capsule daily, preferably at bedtime.IngredientsNOW Foods 5-HTP 50 mg - 90 CapsulesSupplement FactsServing Size: 1 CapsuleServings Per Container: 90Amount Per Serving%DV5-HTP (5-hydroxytryptophan) (Griffonia simplicifolia) (Seed)50 mg**Daily Value Not EstablishedOther Ingredients:Rice Flour and Gelatin (capsule).Contains no:Sugar, salt, yeast, wheat, gluten, corn, soy, milk, egg, shellfish or preservativesWarningsPlease discard the inedible freshness packet enclosed. If you are currently taking antidepressant medications please consult a physician prior to use. May cause drowsiness.