Melatonin and sleep quality: dietary sources and supplementation

Melatonin plays a critical role in regulating sleep-wake cycles by informing the brain that it is nighttime. While supplements can reduce sleep latency and increase rest, experts suggest that natural dietary sources and maintaining a coherent circadian rhythm are vital for long-term sleep architecture.

Specific foods high in melatonin or precursors include kiwis, which contain serotonin and antioxidants; pistachios and walnuts, which provide melatonin alongside magnesium and zinc; and tart cherries, which offer melatonin and tryptophan. Milk is also traditionally associated with sleep support.

Regarding supplementation, occasional use of low doses—ranging from 0.5 to 3 milligrams—may help clear mental fog upon waking, particularly during travel or irregular shift changes. However, higher doses of 5 to 10 milligrams may not provide additional benefits as the body often eliminates the excess. Ultimately, sleep quality is best supported by light exposure, physical movement, and consistent schedules rather than relying solely on supplements.