Now 5-HTP 100 mg Chewables supports a positive mood. Natural Citrus Flavor tablets. 5-HTP, the intermediate metabolite between the amino acid L-tryptophan and serotonin, is extracted from the seed of an African plant (Griffonia simplicifolia). Natural color variation may occur in this product. Recommended Use: Take 1 chewable tablet daily, preferably on an empty stomach at bedtime, or as directed by a healthcare professional. Caution: Xylitol is harmful to pets, seek veterinary care immediately if ingestion is suspected.