5-HTP An Complex is a dietary supplement in capsule form containing 5-HTP, a naturally occurring substance found in the body and used to produce serotonin, a hormone that helps regulate mood and sleep. This product is used to treat insomnia, stress, and anxiety, as it can help improve mood, promote relaxation, and facilitate sleep. Ingredients This product contains 5-HTP (5-hydroxytryptophan), an amino acid naturally found in the body and used to produce serotonin, a neurotransmitter that helps regulate mood and sleep. It may also contain other ingredients such as B vitamins, magnesium, and plant extracts used to promote relaxation and reduce stress and anxiety.