Valerian Root vs Melatonin for Sleep

Quick answer

Melatonin is a hormone with a moderate grade for falling asleep a few minutes sooner at 0.1 to 5 mg. Valerian is a root extract studied at 300 to 900 mg in the evening, with an early grade: people reported better sleep, but timed and lab measures did not differ.^1,2,3

Key facts

Pooled melatonin trials found people fell asleep about 4 to 7 minutes sooner, and a 2024 dose analysis found the effect peaked at about 4 mg a day.^1,4,5
Two valerian meta-analyses found people more likely to report better sleep, about 1.8 times as likely across 6 studies and 1.4 times across 18 trials, with signs that negative studies went unpublished.^3,6
NIH calls the valerian evidence inconclusive, and a 2025 scoping review of 51 trials named valerian and melatonin among the most studied and called the findings promising but inconclusive.^2,7
Melatonin is a hormone the brain makes in response to darkness, while how valerian acts is not agreed, and lab studies point to GABA.^2,8
Both categories raise quality questions: NIH says valerian's composition may vary considerably between production lots, and published tests found melatonin amounts that did not match labels.^2,9,10

A hormone or a herb

Melatonin supplements can be made from animals or microorganisms, but most are made synthetically.⁸

Valerian (Valeriana officinalis) is a perennial plant native to Europe and Asia that also grows in North America. Its root has a distinctive odor that many people find unpleasant.^2,11

That is the main difference. Melatonin is a molecule the body already makes, and supplements are mostly made synthetically. Valerian is a whole plant material, and no single compound explains its effects. One group of candidate compounds, the valepotriates, breaks down in storage, and the levels of others vary widely with the plant and when it was harvested, which is why the extract in one bottle may differ from another.^2,8,12

Side by side

Valerian root and melatonin compared^{1,2,5,8,11,12,13}
	Melatonin	Valerian root
Amount in sleep trials	0.1 to 5 mg a day	300 to 900 mg of root extract
When it was taken	In the evening; one analysis suggested about 3 hours before bed	In the evening; 30 minutes before bed in a 4-week trial
Study length	Mostly short; the effect did not fade with continued use in one pooled analysis	Single nights up to 4 weeks; the gap from placebo widened between day 14 and day 28 in one trial
Forms	Mostly synthetic; tablets, capsules, liquids, gummies and slow-release	Dried root, teas, tinctures and extracts; whole root gave more consistent results in a 2020 review
Upper limit	None set; long-term safety not established	None set; used with apparent safety at 300 to 600 mg a day for up to 6 weeks

The evidence, graded

Helps you fall asleep a little sooner on nights of occasional sleeplessness*^1,4,14

Moderate evidence

Pooled placebo-controlled trials show melatonin shortens the time it takes to fall asleep by about 4 minutes (17 studies, 284 people) to 7 minutes (19 studies, 1,683 people, doses of 0.1 to 5 mg). The effect is consistent but small, most trials were short, many enrolled people with diagnosed sleep problems, and the largest 2 mg trials used a slow-release tablet.

Amount studied: 0.1 to 5 mg, almost always taken in the evening

May modestly improve self-rated sleep quality; not shown on objective sleep measures*^2,3,6,12,15

Early evidence

Two meta-analyses found that people taking valerian were more likely than people taking a placebo to say their sleep had improved: about 1.8 times as likely across 6 studies, with signs that negative studies went unpublished, and about 1.4 times across 18 trials. Time to fall asleep, sleep quality scores and sleep measured in a lab did not differ, most trials had flaws, many enrolled adults with diagnosed sleep problems, and NIH calls the evidence inconclusive.

Amount studied: 300 to 900 mg of root extract in the evening, from single nights up to 4 weeks

The grades differ for a reason you can see in the wording. Melatonin's result is a measured shortening of the time to fall asleep. Valerian's result is a difference in what people said, with no difference in timed measures, quality scores or sleep measured in a lab. A third source, a 2025 scoping review, described the two as the over-the-counter products with the most evidence behind them, while calling the overall findings for all such products promising but inconclusive. It described results rather than grading them.^1,3,7

How fast each acts and what lingers

After an ordinary melatonin dose, blood levels peak in about 50 minutes and half is cleared in about 45 minutes. After a single 600 mg dose of valerian, a marker compound called valerenic acid peaked 1 to 2 hours later in five of six adults and stayed measurable for at least 5 hours.^16,17

In 102 volunteers, 600 mg taken in the evening, once or nightly for 2 weeks, did not slow reaction time or reduce alertness and concentration the next morning.¹⁸

Melatonin may stay active longer in older people than in younger people and cause daytime drowsiness.⁸

Quality and labeling

In a 2023 study, 22 of 25 melatonin gummy products were inaccurately labeled. One had no detectable melatonin, and the rest held 74 to 347 percent of the amount on the label.^8,10

In the United States valerian is sold as a dietary supplement. Because supplements are not always checked for manufacturing consistency, NIH says their composition may vary considerably between production lots.²

Valepotriates break down quickly. In a tincture stored at room temperature for 2 months they fell to less than 5% of their starting level, while valerenic acids were unchanged.¹²

Who might lean toward which

A person who wants the better-graded evidence should know it is melatonin's, and that its effect is a few minutes and its trials were mostly short.^1,4
A person who prefers a plant extract should know that valerian's benefit in pooled trials was self-reported, and that single doses gave less effect than repeated use in a 2020 review.^3,12
Older adults should know that melatonin may stay active longer than in younger people and cause daytime drowsiness.⁸

Safety differences

In very rare cases, liver injury has been reported in people taking valerian, most often in combination with other herbs. NIH's LiverTox database links valerian to rare instances of liver injury, and its long-term effect on the liver is unknown.^11,19

A minority of people in studies felt agitated or restless rather than calm, and in one study a higher dose of the same product raised anxiety while a lower dose did not.¹²

Side effects reported in short-term studies in adults were mild: headache, dizziness, nausea and sleepiness.^8,20

Because melatonin is a hormone, supplements might affect hormonal development in children, including puberty, menstrual cycles and production of the hormone prolactin. NCCIH says this is not known for sure.⁸

Ask your pharmacist or doctor first

NIH's Office of Dietary Supplements says valerian might add to the effects of sedatives and other medicines that slow the nervous system. It names benzodiazepines such as alprazolam, diazepam, lorazepam and triazolam, and barbiturates and other depressants such as phenobarbital, morphine and propofol. NCCIH says valerian should not be taken along with alcohol or sedatives.^2,11

Expected from how the two work, not shown in studies

Ask your pharmacist or doctor first

NCCIH says people taking blood thinner medicines need to be under medical supervision when taking melatonin. A Cochrane review noted case reports suggesting that people taking warfarin may come to harm from melatonin, and called for the possible interaction to be studied.^8,21

Reported in studies

Valerian: ask first if you are pregnant or breastfeeding, have liver disease, have surgery with anesthesia planned, or take sleeping pills, benzodiazepines or opioid painkillers. Do not take it with alcohol, and do not give it to a child younger than 3.^2,11
Melatonin: do not take it while pregnant unless your doctor advises it, and ask first if you have epilepsy, take a blood thinner or are thinking of giving it to a child or teenager.^8,20

What is in our products

What’s in ours

Sleep: Melatonin, 2 mg per serving, from the label

What’s in ours

Sleep: Valerian Extract, 150 mg per serving, from the label

Questions people ask

Is valerian or melatonin better for sleep?

Melatonin has the better-graded evidence, moderate against early, but its effect is small. Valerian's benefit in pooled trials rests on what people reported, not on timed or lab measures.^1,3

Which one acts faster?

Melatonin in the blood peaks about 50 minutes after an ordinary dose. A marker compound from valerian peaked 1 to 2 hours after a 600 mg dose, and in a 2020 review single doses of valerian gave less effect than repeated use.^12,16,17

Do either cause next-day drowsiness?

In one small study people felt sleepier the morning after 900 mg of valerian, while 600 mg did not slow reaction time in 102 volunteers. Melatonin may stay active longer in older people and cause daytime drowsiness.^2,8,18

Which has more cautions with other medicines?

Both need a pharmacist's advice. NIH says valerian might add to the effects of sedatives and other medicines that slow the nervous system, and NCCIH says people taking blood thinners need medical supervision with melatonin.^2,8

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Sources

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.