5-HTP is a Precursor to Serotonin.
Nutricost 5-HTP 5-Hydroxytryptophan 100 mg - 240 Capsules Easy To Take Capsules 5-HTP (5-Hydroxytryptophan) is a compound that is produced internally within the body from tryptophan, which is an amino acid.. Made in a GMP Compliant Facility. Made in a GMP Compliant and FDA Registered Facility.