Can you take valerian root and melatonin together?

No trial has tested valerian root and melatonin taken together. Melatonin's own sleep-onset evidence, pooled across 19 trials in more than 1,600 people, is larger and more consistent than valerian's, which disagrees with itself across its largest reviews. No research identifies a specific reason the two can't be combined; the caution people search for is a general one about drowsiness, not a documented conflict.

What the evidence doesn't support

It doesn't support a claim that valerian and melatonin work better together than either alone — that combination has never been tested. It doesn't support treating either as a treatment for insomnia or any diagnosed sleep disorder. And it doesn't support the idea, sometimes searched directly, that there's a specific known reason the two "can't" be taken together — no trial or case report reviewed here identifies one.

What the trials found

Melatonin's evidence is the larger and more consistent of the two. A 2013 meta-analysis pooled 19 randomized, placebo-controlled trials, 1,683 people total, and found melatonin shortened the time it took to fall asleep by about 7 minutes and added about 8 minutes of total sleep time versus placebo, with sleep quality also improving; higher doses and longer trials were linked to bigger effects (PMID 23691095).

Valerian's evidence is thinner and inconsistent with itself. A 2006 meta-analysis of 16 trials found a modest benefit on a simple yes/no sleep-improvement measure, but the authors flagged evidence of publication bias in that result (PMID 17145239). A 2020 review of 10 trials using numeric outcomes found a small, not-statistically-significant effect overall (PMID 33086877). A 2024 umbrella review of 8 systematic reviews concluded valerian has a good safety profile but no empirical support for treating insomnia when judged by objective sleep measures (PMID 38359657).

Neither valerian trial tested melatonin, and melatonin's own trial base doesn't include valerian. No study has measured what, if anything, changes when the two are taken at the same time.

Ingredient	Best evidence	Population	Dose in that trial
Melatonin	~7 min faster sleep onset, ~8 min more total sleep vs placebo (n=1,683, pooled)	Adults and children with sleep disorders	Varied across 19 trials
Valerian root	Meta-analyses that disagree with each other; no benefit on objective measures per 2024 umbrella review	Adults, pooled across trials	225-1,215 mg/day across trials
Both together	No trial exists

Questions people ask

Can you take melatonin and valerian root together?

There's no trial of the combination, so there's no research describing an added effect from taking them together beyond what either does on its own. Both are commonly reported to cause drowsiness, and combining two ingredients that can each make you sleepy — especially alongside alcohol or a sedative — is a reasonable thing to be cautious about, particularly the first time you try that combination or before driving. A doctor or pharmacist can weigh that against anything else you take.

Can you take melatonin with valerian root?

Same answer: no dedicated trial has tested it, so there's no data showing a specific interaction, positive or negative — only an absence of testing.

Why can't you take valerian root and melatonin together?

No research reviewed here identifies a specific reason they can't be combined. The general caution is about additive drowsiness from combining two things that can each cause it, not a documented interaction or contraindication.

Is valerian root better than melatonin?

See valerian root vs melatonin for the two literatures compared directly. Melatonin's sleep-onset evidence is larger and more consistent; that's a description of the evidence, not a recommendation.

Does valerian root work like melatonin?

The two are studied differently and work through different proposed mechanisms — melatonin is a hormone involved in the body's sleep-wake signaling, while valerian's proposed mechanism involves a compound, valerenic acid, that slows the breakdown of a calming brain chemical in lab research. Neither mechanism has been tested with the other ingredient present.

When to talk to a doctor

Trouble sleeping that lasts more than a few weeks, or that affects daily functioning, is worth bringing to a doctor. Neither valerian nor melatonin is a treatment for insomnia or a diagnosed sleep disorder, and nothing in the evidence above supports using either, alone or combined, as a substitute for medical evaluation. If you're pregnant, nursing, or take a prescription medication — especially anything sedating — talk to a doctor before adding either one.