Verdict
Strong consensus against
Taking melatonin every night is safe for most adults.
5 sources: 2 partly, 3 negative
By Arun AgrahriLast reviewed
Short answer
It is contested. Melatonin is a hormone, not just a supplement, and a commercial dose runs 10-30x what your body makes, which is why Andrew Huberman warns most adults off it. Others take it nightly or use it for circadian reset. The common ground: morning sunlight first, to protect your own production.
Melatonin is worth taking for sleep.
The verdict on Melatonin overall. 6 sources: 2 positive, 4 partly
positive partly neutral negative Each researcher and each study counts once per claim, however often they come up.
Taking melatonin every night is safe for most adults.
5 sources: 2 partly, 3 negative.
Researchers say
2 partly, 3 negative
Guy Leschziner, on The Diary Of A CEO, at 1:04:45
Partly Video · Opinion
Open the tape at 1:04:45 →“it's generally a pretty well tolerated safe drug as far as we know”
Mark Hyman, on The Dr. Hyman Show, at 29:30
Partly Video · Opinion
Open the tape at 29:30 →“melatonin anywhere from half a milligram to up to three milligrams can be a great adjunct to sleep”
Andrew Huberman, 2 mentions on this claim
Negative Video
on Huberman Lab, at 1:17:31 · negative
“But taking it chronically over time, especially kids taking it chronically over time, can potentially be problematic.”
on Huberman Lab, at 19:23 · negative
“My personal bias on this is, except in rare cases, no,”
Matthew Walker, on The Dr. Hyman Show, at 1:15:03
Negative Video · Opinion
Open the tape at 1:15:03 →“melatonin I probably wouldn't favor it right now if you're going to do it you're probably taking too much”
Michael Breus, on The Diary Of A CEO, at 1:31:36
Negative Video · Opinion
Open the tape at 1:31:36 →“Yeah, I would argue it's a bad idea. So, if you have a melatonin deficiency, sure, have it every day.”
Studies show
No study counted yet.
Guy Leschziner, on The Diary Of A CEO, at 1:04:45 Video · partly · Opinion
“it's generally a pretty well tolerated safe drug as far as we know”
Mark Hyman, on The Dr. Hyman Show, at 29:30 Video · partly · Opinion
“melatonin anywhere from half a milligram to up to three milligrams can be a great adjunct to sleep”
Andrew Huberman Video · negative · 2 mentions
on Huberman Lab, at 1:17:31 · negative · Opinion
“But taking it chronically over time, especially kids taking it chronically over time, can potentially be problematic.”
on Huberman Lab, at 19:23 · negative · Opinion
“My personal bias on this is, except in rare cases, no,”
Matthew Walker, on The Dr. Hyman Show, at 1:15:03 Video · negative · Opinion
“melatonin I probably wouldn't favor it right now if you're going to do it you're probably taking too much”
Michael Breus, on The Diary Of A CEO, at 1:31:36 Video · negative · Opinion
“Yeah, I would argue it's a bad idea. So, if you have a melatonin deficiency, sure, have it every day.”
Taking melatonin every night is safe for most adults.
Guy Leschziner, on The Diary Of A CEO, at 1:04:45
Partly Video · Opinion
Open the tape at 1:04:45 →“it's generally a pretty well tolerated safe drug as far as we know”
Mark Hyman, on The Dr. Hyman Show, at 29:30
Partly Video · Opinion
Open the tape at 29:30 →“melatonin anywhere from half a milligram to up to three milligrams can be a great adjunct to sleep”
Andrew Huberman, 2 mentions on this claim
Negative Video
on Huberman Lab, at 1:17:31 · negative
“But taking it chronically over time, especially kids taking it chronically over time, can potentially be problematic.”
on Huberman Lab, at 19:23 · negative
“My personal bias on this is, except in rare cases, no,”
Matthew Walker, on The Dr. Hyman Show, at 1:15:03
Negative Video · Opinion
Open the tape at 1:15:03 →“melatonin I probably wouldn't favor it right now if you're going to do it you're probably taking too much”
Michael Breus, on The Diary Of A CEO, at 1:31:36
Negative Video · Opinion
Open the tape at 1:31:36 →“Yeah, I would argue it's a bad idea. So, if you have a melatonin deficiency, sure, have it every day.”
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Whether melatonin is safe every night is contested, and it is the most divisive supplement in the sleep stack.
Andrew Huberman, on his own show, objects to what it is. Melatonin is a hormone with effects across the endocrine system, not just a supplement. A commercial dose of 3-10mg is 10-30x what the body makes on its own, about 0.1-0.3mg. In healthy adults it adds only a few minutes of total sleep. He reaches for magnesium threonate, apigenin and theanine instead.
Bryan Johnson takes it nightly, after his team reviewed the evidence. Mark Hyman recommends it widely, for sleep, circadian reset and even acid reflux.
Rhonda Patrick notes that rising melatonin tells the pancreas to make less insulin, so eating late at night costs you more.
The part everyone agrees on is free. Morning sunlight and dim light at night matter more than any pill.
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Full Melatonin evidence report
The verdict on every claim, and where the sources disagree