Melatonin, a hormone primarily known for regulating sleep-wake cycles, has also been found to play a role in hair growth. Research suggests that melatonin acts as a powerful antioxidant, protecting hair follicle cells from oxidative stress, which is a common factor in hair thinning and loss. Additionally, melatonin interacts with hair follicle receptors to prolong the anagen (growth) phase of the hair cycle, thereby reducing premature hair shedding. Studies indicate that topical application of melatonin can enhance hair density and reduce hair loss, particularly in individuals with androgenetic alopecia or telogen effluvium. This is thought to occur due to melatonin's ability to downregulate dihydrotestosterone (DHT), a hormone linked to hair follicle miniaturization. Furthermore, melatonin may improve microcirculation in the scalp, ensuring that follicles receive essential nutrients and oxygen for optimal growth. Overall, melatonin's antioxidative, anti-inflammatory, and hormone-modulating effects make it a promising ingredient for hair growth treatments.