Melatonin and Serotonin: Is Melatonin a Hormone?

Yes — melatonin is a hormone. Your body makes it in the pineal gland in the brain, where it acts as a chemical messenger of darkness that helps regulate your sleep-wake cycle. It's closely tied to serotonin: your body converts serotonin into melatonin as darkness falls.

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Restful You* Liquid Melatonin Shop Restful You* Liquid Melatonin

What melatonin is and where it comes from

Melatonin is a hormone produced by the pineal gland. Light exposure suppresses it and darkness increases it, so its natural rise in the evening helps signal that it's time to sleep.*

The serotonin–melatonin relationship

Serotonin and melatonin are linked: as evening comes, the body converts serotonin into melatonin. That shift is part of how your internal clock moves you from daytime alertness toward nighttime rest.

How supplementing supports your natural cycle

Because melatonin is a compound your body already makes, supplementing with a clean liquid like Restful You* is intended to reinforce your natural sleep-wake cycle — cueing sleep timing rather than overriding it. It's non-habit forming†.*

Can you take it every night? →

Frequently asked questions

Is melatonin a hormone?

Yes — it's a hormone made in the pineal gland that helps regulate your sleep-wake cycle.*

How are serotonin and melatonin related?

The body converts serotonin into melatonin as darkness falls, which supports the shift toward sleep.

Does taking melatonin stop my body from making it?

Melatonin is non-habit-forming† and is intended to support your natural rhythm; for long-term use, consider a qualified healthcare professional's guidance.*

References

  1. Savage RA, Zafar N, Yohannan S, et al. Melatonin. StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; updated 2024 Feb 9.
  2. Ebrahim YM, Sadek MA, Sabry MO, et al. Integrative sleep management: from molecular pathways to conventional and herbal treatments. Naunyn Schmiedebergs Arch Pharmacol. 2025;398(10):13515–13543.