Melatonin Supplements: Doses, Formats and What the Guidance Says
Melatonin is sold across an unusually wide dose range — from under 1 mg to 10 mg and above — and its regulatory status differs sharply between countries. Both facts matter before you compare products.
The dose range is the whole story
The same brand often sells the same product at four different strengths in near-identical packaging. Doses commonly sold in the United States are substantially higher than those typically used in countries where melatonin is a prescription medicine, and higher does not mean more effective. Our dosage guide covers what the reviews and guidance describe.
Regulatory status
In the US melatonin is sold as a dietary supplement. In the UK, Ireland and much of the EU it is a prescription-only medicine. If you are reading this from Europe, the products in our comparison are US listings and the position where you live may be different.
Format changes the per-unit dose
Tablets, capsules, gummies, lozenges, liquids and sprays all appear here, alongside fast-dissolve and extended-release versions that are labelled separately. Gummies frequently count two units as one serving. Reading the dose per unit rather than the bottle total avoids the most common mix-up.
Safety
Melatonin interacts with several medication classes including anticoagulants, anticonvulsants, immunosuppressants and some blood pressure medicines. It is not recommended in pregnancy. Testing of US products has repeatedly found actual content differing from the label, and paediatric ingestions have risen sharply enough for public health bodies to comment — melatonin products should be stored out of reach of children, and given to a child only on medical advice.
Our guide to melatonin upper doses and side effects and interactions cover this. Persistent sleep problems are worth taking to a doctor rather than a supplement aisle.
Comparing products
Our melatonin comparison filters by strength, format, brand and pack size.