: Look for products with seals from organizations like USP or NSF International to ensure the dose matches the label.
: 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. buy melatonin online
: Approximately 26% of tested supplements contained serotonin , a hormone that can cause dangerous reactions when mixed with other medications like antidepressants. : Look for products with seals from organizations
: 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. : Testing by the Therapeutic Goods Administration (TGA)
: 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
: Research published in JAMA found gummy formulations were the most likely to be mislabeled.