Short-term, yes for most adults - NCCIH says short-term use appears safe, but long-term nightly use has no solid safety data behind it.
Two shaping facts: melatonin is a hormone sold as a loosely-regulated supplement (tested bottles contained 74 to 347 percent of the labeled amount, most of them over), and it treats body-clock timing - jet lag, delayed sleep phase, shift work - rather than insomnia itself; for chronic insomnia, CBT-I is the recommended treatment. Use it as a weeks-long schedule tool at the lowest working dose, and treat month-after-month reliance as a sign to look deeper. Pregnant, breastfeeding, or on blood thinners, epilepsy drugs, or immunosuppressants? Ask a clinician first. Pymander is a free AI doctor, 24/7 by text, and can help you think through your sleep.
What to do
Common questions
Can I take melatonin every night?
For most adults, nightly melatonin in the short term looks fine - NCCIH's summary is that short-term use appears safe for most people - but the honest answer for open-ended nightly use is that nobody knows: information on long-term safety is lacking. Two facts should shape the habit. First, melatonin is a hormone, not a vitamin, and in the US it is sold as a supplement with loose oversight: when researchers tested bottles, actual content ranged from 74 to 347 percent of what the label claimed - most contained more than stated. Second, it treats timing, not insomnia: it is genuinely useful for jet lag, delayed sleep phase, and shift-work adjustment, but for chronic insomnia the evidence is weak and the recommended treatment is cognitive behavioral therapy (CBT-I). So the sensible frame: fine as a weeks-long tool for a schedule problem at the lowest dose that works, and a sign to look deeper if you need it month after month. Pregnant, breastfeeding, or on blood thinners, epilepsy drugs, or immunosuppressants? Interactions and unknowns argue for asking a clinician first. Pymander is a free AI doctor, 24/7 by text, that can help you think through your sleep.