Understanding melatonin means starting with its role in the body and distinguishing physiology from the use of a product.
01 · Yes, melatonin is a hormone
Melatonin is a hormone naturally present in the body. Its levels tend to increase at night and decrease during the day, helping to regulate sleep. The NHS explanation.
02 · The link to light and darkness
Circadian rhythms follow a cycle of approximately 24 hours. Light received by the eyes helps the central biological clock coordinate the production of melatonin. Light from devices at night can also interfere with these signals. Learn more from the NIGMS.
03 · Its natural role is not a universal cure
The effects of a product depend on its use and context. Evidence regarding melatonin does not justify promises of rejuvenation or treatment for every sleep disorder. For persistent issues, an individual assessment is needed. Evidence and limitations according to the NCCIH.
04 · Safety and usage instructions
“Natural” does not mean free of side effects. If you are taking medication, are pregnant, or are considering using it for a child, seek medical advice first. Follow the product instructions without increasing the dose on your own. Precautions to know.
Explore the formulas
The original Dr. Pierpaoli products pages list ingredients, formats, and usage instructions.
Updated October 7, 2026. General information; it does not replace an individual medical assessment.