NOW Foods Melatonin 5 mg Sustained Release tablets provide a steady 4-hour release for gradual sleep support. Melatonin is a powerful free radical scavenger naturally produced in the pineal gland and present in the GI tract, supporting healthy sleep/wake cycles, immune function, and GI lining. This vegan formula is GMP quality assured and packaged in the USA by a family-owned company since 1968. Each bottle contains 120 tablets.