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British consumer watchdog Which? has uncovered prescription-only melatonin products being advertised and sold on major online marketplaces, including AliExpress, Amazon, eBay, Etsy, Superdrug Marketplace and Temu, in an investigation covering October 2025 to January 2026.
Which? found products with doses far above typical NHS starting guidance — often listed at 10mg and, in one case, a product claiming 30mg — and noted sellers hiding melatonin in ingredient lists or disguising names (eg. 'melat onin') to evade detection.
The watchdog flagged items marketed as 'night-time fat burners', patches and teas that contained melatonin or listed it only in descriptions.
Platforms said they removed flagged listings and were taking enforcement action; Superdrug said it has approached the Medicines and Healthcare products Regulatory Agency (MHRA) for clarity on topical products containing melatonin.
In the UK melatonin is a prescription medicine because it can interact with common drugs such as antidepressants and hormonal contraception and cause side effects including dizziness and mood changes.
Which? warned that unchecked online sales pose health risks and called for stronger oversight and enforcement.






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