Melatonin is sold as a dietary supplement in much of the world. The amounts below are common over-the-counter ranges, provided for education — not a prescription. Follow product labeling and talk to a clinician about your situation.
Overview
Melatonin is a hormone whose most-studied variable is often timing relative to your circadian phase, rather than raw quantity. It is widely available as a supplement, and more is not necessarily better — low amounts at the right time are frequently emphasized in the research.
Common dosing pattern
Common over-the-counter amounts:
- Frequently used in the range of 0.5-5 mg taken at night, before bed.
- Lower amounts (around 0.5-1 mg) are often discussed for circadian timing; higher amounts are common in retail products but are not necessarily more effective.
- Taken shortly before the desired sleep time, or as directed for jet lag / shift-work timing.
Starting low is a reasonable approach, since larger amounts can cause grogginess.
Why timing matters
A recurring theme in melatonin research is that its circadian phase-shifting effect depends strongly on when it is taken relative to your own night-time signal. This is conceptually different from a sedative, where the effect tracks more directly with amount — which is why timing is often discussed as the primary lever.
Formulation differences
Melatonin comes in formats that behave differently over time:
- Immediate-release products release melatonin quickly.
- Extended- or prolonged-release products spread exposure out across the night.
- Sublingual and gummy formats differ in how quickly they are absorbed.
When to involve a clinician
Melatonin's effects vary by person and formulation, and it can interact with other medications. Product labeling and a qualified clinician are the appropriate sources for any real-world decision — particularly for children, during pregnancy, or alongside other medicines.