OstroVit - Histidine is an amino acid...
Food supplement UNS - Melatonin helps to regulate the process of falling asleep.
Dietary supplement IronFlex - Melatonin Sleep contains melatonin, which contributes to regular healthy sleep.
Swanson Melatonin contains melatonin, which helps control your sleep/wake cycle.
Swanson 5-HTP & Melatonin contains 5-HTP and melatonin, which regulates the sleep-wake cycle.