The reported result concerns tested products
NCCIH summarizes a 2023 study in which 22 of 25 over-the-counter melatonin gummy products were inaccurately labeled. One had no detectable melatonin; among the others, measured amounts ranged from 74% to 347% of the label claim. [1]
These are findings from a particular sample and testing period. They are not an assay of a container a reader owns or proof that every batch from a named brand has the same discrepancy. [1]
A percentage of the claim is not the same as an excess percentage
An amount equal to 347% of the label claim is about 3.47 times that claim. It is 247% above the claim, not 347% above it. Keeping the denominator explicit prevents exaggerating the finding. [1]
The study summary also does not tell a reader to compensate by taking a fraction based on the sample’s largest discrepancy. Their own product may differ. [1]
Do not convert a historical assay into a current dose correction
Imagine a hypothetical label states one milligram. A measurement at twice that claim would equal two milligrams for the tested unit, but that hypothetical ratio cannot be applied to an untested product.
The arithmetic explains the label comparison; it does not verify an individual gummy or support a self-adjusted dose.
| Detail | Meaning |
|---|---|
| 100% of a label claim | Matches that amount |
| 200% of a label claim | Twice the amount; 100% above |
| A historical tested sample | Not a current-lot certificate |
Product uncertainty matters especially around children
NCCIH recommends discussing pediatric use with a health care provider and storing melatonin out of children’s reach and sight. Candy-like presentation does not make accidental ingestion harmless. [1]
This page does not reproduce a current brand ranking or independently reappraise the laboratory study. It explains the government summary and the limits of applying it to present products. [1]
Sources for this article
- NCCIH: Melatonin—What You Need To Know
Source consulted: 2026-09-17. This is a reference resource, not a claim that we conducted the studies or tested a product.