5-HTP Power [Nervous] contains hydroxytryptophan, a precursor to serotonin, an important neurotransmitter that helps regulate appetite, mood and sleep. It is converted into serotonin in the body, which may help elevate mood, assist in controlling hunger and promote restful sleep. NSP 5-HTP Power is blended with three adaptogenic herbs Siberian ginseng, ashwaganda and sumathat work synergistically with 5-HTP to help the body adjust to changes. It also contains vitamin B6 and zinc, which enhance the bioavailability of 5-HTP. Each capsule of 5-HTP Power contains 35 mg of 5-HTP. Take 1 capsule three times daily with a meal. As a sleep aid, take 13 capsules of 5-HTP Power with an evening meal. We recommend a maximum of 3 capsules of 5-HTP Power per day. Because the body rapidly excretes excess 5-HTP, taking 35 mg at each meal is generally more effective than taking 12 capsules per day of higher potency 5-HTP. NOTE: If taking a prescription medication, consult a health-care practitioner before taking this product. Pregnant or nursing women should seek the advice of a health-care practitioner before using this supplement.