5-HTP is an amino acid related to tryptophan & serotonin. Each capsule contains 50 mg of 5-HTP, together with 3.4 mg of pyridoxal-5-phosphate (supplying 2.3 mg of vitamin B6). These capsules are suitable for vegetarians. 5-Hyroxytryptophan is an intermediate metabolite in the synthesis of serotonin from tryptophan & requires Tetrahydro Biopterin as the coenzyme. The conversion of 5-Hydroxytryptophan to serotonin requires Pyridoxal-5-Phosphate (Vit B6) as the coenzyme. Contra-Indications If pregnant or breast feeding, consult your health care practitioner before using. For more information on this product contact your healthcare practitioner. This product should not be used as a substitute for a varied diet. Directions Recommended dose 1 capsule per day with a meal. Do not exceed this recommended dose unless prescribed by your practitioner.