How Much Melatonin Should You Take? A Simple Dosage Guide
If you've ever stood in the supplement aisle wondering whether to grab the 3mg, 5mg, or 10mg melatonin, here's the short answer that surprises most people: less is usually more. For most adults, a dose between 0.3mg and 1mg is enough to support sleep — and the mega-doses on store shelves can actually work against you.
Let's break down how much melatonin to take, when to take it, and how to avoid the groggy "melatonin hangover."
What melatonin actually does
Melatonin isn't a sedative — it's a timing signal. Your brain naturally releases it as darkness falls to tell your body that night has arrived. Taking it as a supplement reinforces that signal, which is why it helps most with falling asleep and with resetting a shifted schedule (like jet lag), rather than knocking you out.
The best melatonin dosage for sleep
Research consistently suggests that low doses are effective for most people, and that going higher rarely adds benefit:
| Dose | Best for | Notes |
|---|---|---|
| 0.3–0.5mg | Everyday sleep support | Closest to what your body makes naturally |
| 0.5–1mg | Falling asleep faster | The sweet spot for most adults |
| 1–3mg | Jet lag / schedule shifts | Short-term use |
| 5–10mg | Rarely necessary | Higher grogginess risk; no added benefit for most |
When should you take melatonin?
Timing matters as much as dose. Take melatonin about 30–60 minutes before your target bedtime. Taking it too late (right as you get into bed) or too early can shift your rhythm the wrong way. Keep lights dim afterward so you don't cancel out the signal.
Why high doses can backfire
Large doses stay in your system longer, which is what causes next-morning grogginess. They can also make your body less responsive over time. A low, precise dose is designed to nudge your natural rhythm rather than flood it — which is exactly why quality formulas keep melatonin low and pair it with calming ingredients.
A low, precise dose — done right
Yu Sleep uses just 0.9mg of melatonin alongside magnesium, L-theanine and GABA — enough to signal sleep without the next-day fog.
See the Yu Sleep Formula →Melatonin side effects & safety
Melatonin is generally well tolerated at low doses. Possible side effects include grogginess, vivid dreams, or headaches — usually a sign the dose is too high. It's not recommended for pregnant or nursing women without medical guidance, and it can interact with certain medications. Always talk to your healthcare provider before starting, especially if you take other medicines.
The bottom line
For most adults, 0.5–1mg of melatonin, taken 30–60 minutes before bed, is the smart starting point. Skip the mega-doses. And remember melatonin works best as part of good sleep habits — see our guide on how to fall asleep faster and the full rundown of the best natural sleep aids.