Melatonin, a hormone produced naturally by the body's pineal gland, helps regulate sleep-wake cycles. When taken as a supplement, melatonin's duration in the body can vary depending on several factors, including the dosage, individual metabolism, and other factors.
Generally, the half-life of melatonin is around 3 to 4 hours. This means that it takes about 3 to 4 hours for the body to eliminate half of the melatonin from the bloodstream. However, it may take longer for melatonin to be completely cleared from the system.
Most people will typically experience the effects of melatonin for around 4 to 8 hours after taking a standard dose, but individual responses may vary. It's important to note that melatonin supplements should be used according to the recommended dosage and under the guidance of a healthcare professional, especially for long-term use.