Valerian for Sleep: Evidence, Extracts and Next-Day Effects

What is valerian?

Valerian is an herb whose roots and underground stems are used in teas, powders and extracts. Most sleep research concerns Valeriana officinalis. Products are also sold in combination with other sleep ingredients.

People usually take valerian to fall asleep more easily or feel calmer.

How do traditional uses compare with modern products?

NCCIH traces valerian’s medicinal use to ancient Greece and Rome^[1]. Its broader account of historical uses lists sleeplessness, migraine, fatigue and stomach cramps. That historical account does not establish that today’s capsules treat all those conditions. Modern products use the root and rhizome, but a tea, ground root and concentrated extract can deliver different constituents.

The European Medicines Agency^[2] makes a useful distinction: certain dry ethanolic root extracts have well-established medicinal use for mild nervous tension and sleep disorders, while other preparations rely on traditional use for mild mental stress and to aid sleep. Its assessment concerns herbal medicines meeting pharmaceutical requirements. It is not a blanket endorsement of valerian food supplements or a finding that every preparation treats chronic insomnia.

Why do people take valerian?

Claimed benefit	Dose / form studied	Research verdict	Evidence strength
Improve sleep quality or falling asleep	Different extracts, often 300–600 mg in short studies	^[1]	Limited
Treat chronic insomnia	Multiple preparations	The American Academy of Sleep Medicine guideline weakly suggests not using valerian for chronic insomnia.	Not rated — guidance
Reduce anxiety	No established general regimen	Adequate clinical evidence is lacking.	Insufficient

When to ask before taking it

Avoid combining valerian with alcohol or sedating medicines without a clinician's advice. If you need to drive early, work at height or stay alert overnight, next-day dullness matters even if you feel that you fell asleep faster.

Common dosage and timing

As of 2026, there is no recognized recommended daily amount for valerian. The NIH fact sheet describes 300–600 mg daily for up to six weeks among studied short-term exposures. This range is not a proven effective dose or an established upper limit.

Some trials gave the product before bedtime; the timing varied with the preparation.

If you have used valerian regularly for a long time, discuss stopping with a pharmacist or clinician. Withdrawal symptoms have been reported after chronic use; a universal taper cannot be inferred from the available research.

What should persistent insomnia prompt?

A review of sleep habits, sleep apnea symptoms, restless legs, medicines and mood can identify more useful next steps. Persistent insomnia also deserves discussion of treatments such as cognitive behavioral therapy for insomnia.

What should the label tell you?

Check the species, root or rhizome (underground stem), powder versus extract, and daily serving. Some extracts are standardized by measuring selected compounds, called markers, to help keep batches consistent. A valerenic-acid percentage describes the measured composition; it is not a measure of sleep benefit. ^[3]

In combination products, identify every sedating ingredient and its amount. A trial of a valerian-containing blend does not establish the same effect from valerian alone.

Drawbacks and side effects

Potential drawback	When/who it affects	Research evidence	Practical implication
Mental dullness, headache or stomach symptoms	Some users	Reported side effects	Judge next-day functioning as well as bedtime effects.
Vivid dreams or excitability	Some users	Reported	Reassess if sleep feels worse.
Added sedation	Alcohol or sedative combinations	NIH advises against combining	Have the complete sleep regimen reviewed.
Withdrawal or rare liver concern	Chronic use; liver cases often involved mixtures	Reports; mixtures make the cause uncertain	Discuss stopping after prolonged use; seek care for jaundice or dark urine.

Women who are pregnant or breastfeeding should discuss use because safety is poorly characterized.

What does the sleep research show?

In one internet-based randomized study^[4], 434 people were randomized and 405 contributed post-treatment diary data. After two weeks, the main comparison of meaningful sleep-quality improvement was not statistically conclusive. A secondary overall rating was more favorable.

That is a mixed result. The final overall ratings came from 328 people, a smaller subset, which also matters when interpreting that secondary finding. The study used 600 mg of Valerina Forte extract nightly; next-day energy ratings did not clearly improve over placebo.

A separate trial in 16 older women^[5] found no clear advantage for valerian over placebo after 300 mg of extract 30 minutes before bed for two weeks, whether measured by diaries, wrist movement or laboratory sleep recording. Across the literature, the review^[6] describes preparation and outcome differences that make a universal sleep promise difficult.

A newer extract study found some positive results

An eight-week Sleeproot trial^[7] enrolled adults aged 18–50 with mild sleep complaints. It randomized 80 people, but the main benefit analysis included only the 72 who finished. Leaving out people who did not finish can change the apparent result. Sleep-quality questionnaires and selected wrist-tracker measures favored treatment. Daytime sleepiness and feeling refreshed also improved on questionnaires. In the smaller laboratory-sleep subset, some measures improved while several sleep stages did not.

The manufacturer funded the study. The researchers also tested many outcomes at several times; with more comparisons, there are more chances for a favorable result to occur by chance. The paper calls the nightly capsule 200 mg of extract but also describes a finished powder containing extract, cellulose and silica, with total valerenic acid measured as its standardization marker. That unresolved amount basis prevents a straightforward match to a bottle labeled “200 mg valerian.”

Does valerian help anxiety or stress?

Feeling calmer and treating an anxiety disorder are different questions. In a four-week pilot trial^[8], 36 people with generalized anxiety disorder received valepotriates, diazepam or placebo, with 12 assigned to each group. The main anxiety-score comparison found no clear difference between groups. Some symptom scores improved within the valepotriate group, but improvement within one group does not show that it outperformed placebo. Valepotriates are also a specific preparation, not an interchangeable dose of valerian root.

A four-week study in stressed volunteers^[9] tested 100 mg of valerian root extract three times daily. It found changes in measured brain activity, but symptom scales did not improve more than with placebo. Brain activity can help researchers explore a possible effect; it does not by itself establish relief from anxiety. The Sleeproot sleep trial described above also found a small improvement in anxiety questionnaires: after eight weeks, scores fell by about one point on a 0–63 scale, compared with almost no change on placebo. These were the same 72 people who finished the trial, who entered with no more than mild anxiety. The study limitations described above also apply to this secondary finding. Together, these studies leave the broader anxiety claim uncertain.

What about menopausal symptoms?

Hot flashes are a separate outcome from sleep quality. A small root-powder trial^[10] reported less frequent and less severe hot flashes after eight weeks compared with placebo. Its results section describes 76 women allocated and 68 analyzed, although the abstract presents 68 as the study population. The abstract and methods also disagree on the capsule amount, and parts of the report disagree on assessment timing. Those reporting problems limit confidence and make it unsuitable as a dosing guide.

NCCIH describes the menopause evidence as too limited for firm conclusions.

Is valerian with hops different?

Yes. A 2025 feasibility trial of Ze 91019^[11] tested one nightly tablet containing 500 mg of valerian root extract plus 120 mg of hop-cone extract for 21 days. It randomized 41 adults with occasional sleep problems; 40 completed the study. People diagnosed with insomnia were excluded.

The exploratory analysis estimated about 22 extra minutes of sleep per night compared with placebo, measured by a consumer wrist tracker. It found no clear improvement in subjective sleep quality, daytime memory, reaction time, mood or stress. The study’s main purpose was to test whether the research approach was feasible, and the manufacturer funded it.

The bottom line

Valerian offers uncertain sleep benefit and can affect alertness. If you try a product, know the exact preparation and all other sedating ingredients, and assess how you function the next day. Ongoing insomnia warrants a broader assessment.

Help us improve this article

Spotted an error or found a source we should consider? Tell us which part of this article needs another look and include a link if you have one. Please leave out personal health details and lab results; we can’t answer individual medical questions.