Melatonin, B6 VeganSustained ReleaseDietary Supplement Vegan Sustained Release Suitable for Vegetarians/Vegans Melatonin is a hormone secreted by the pineal gland that aids biorhythm regulation. Biorhythm is disturbed by stress, crossing time zones and changing work shifts. Melatonin production also declines with age. Vitamin B6 aids melatonin metabolism.