Melatonin

Melatonin ishormone produced bypineal gland, located incenter ofbrain. It isderivative ofamino acid tryptophan.

Melatonin helps regulate sleep-wake or circadian rhythms. Normally, productionmelatonin bypinealstimulated by darknessinhibited by light.

In recent times, melatonin has become available asdrug andsupplement. It appearshave some use against insomniajet lag.