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: Approximately 26% of tested supplements contained serotonin , a hormone that can cause dangerous reactions when mixed with other medications like antidepressants.

: Testing by the Therapeutic Goods Administration (TGA) in late 2025 found that some online products marketed as melatonin contained none of the active ingredient at all. buy melatonin online

: Research published in JAMA found gummy formulations were the most likely to be mislabeled. : Especially for children, doctors warn that "black-market"

: Especially for children, doctors warn that "black-market" melatonin can cause toxicity symptoms like extreme sleepiness and vomiting due to accidental overdose. TGA issues warning on online melatonin - RACGP Prescription-only medicine : Look for products with seals

It is illegal to market or sell without a prescription. Legitimate online pharmacies like Boots or Superdrug require a digital consultation first. Prescription-only medicine

: Look for products with seals from organizations like USP or NSF International to ensure the dose matches the label.