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: A study published in the Journal of Clinical Sleep Medicine analyzed 31 supplements and found that melatonin content ranged from -83% to +478% of what was listed on the label.

: 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

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 : A study published in the Journal of

: Recent 2025 research indicated that long-term melatonin use (12+ months) was associated with a 90% higher chance of incident heart failure compared to non-users, though researchers noted this shows a connection rather than direct cause. Legal & Safety Status by Region Purchase Recommendation United States Over-the-counter (OTC) supplement Available at major retailers like Walmart and Amazon . UK / Australia Prescription-only medicine Legitimate online pharmacies like Boots or Superdrug require