Melatonin is a dietary supplement and medication as well as a naturally occurring hormone. [7][10] As a hormone, melatonin is released by the pineal gland and participates in the sleep-wake cycle. [7][10] As a supplement, it is commonly used for the short-term treatment of insomnia, such as jet lag

Melatonin is a hormone synthesized by the pineal gland using tryptophan. Its most well-known function is to improve sleep. Melatonin secreted by pineal gland shows a strong physiological cycle law, which is related to the alternation of day and night. It secretes less during the day and more at night. One is people who need jet lag and shift work.

Melatonin is a hormone produced by the brain in response to darkness. It helps to adjust your circadian rhythm (24-hour internal clock) and sleep. Exposure to light at night will hinder the production of melatonin. Studies have shown that melatonin also plays other important roles in the body beyond sleep. However, these effects have not been fully understood.