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Botanical & herbal supplements

Valerian

Valeriana officinalis

Valerian (Valeriana officinalis) is a root-based bedtime herb with mixed sleep evidence. Some preparations have positive trials, but results do not transfer reliably to every powder, extract or liquid. Compare the actual preparation and serving amount first, then price; a lower price per gram does not establish equivalent potency or sleep benefit.

Whole HerbStandardized ExtractTraditional UseEuropean HerbalismClinical ResearchLimited Human EvidenceMixed Evidence
Updated October 2026/6 min read/8 citations
Reviewed by the NootropicsIndex editorial team.Method: prioritize cited human research and official safety or regulatory sources; compare retailer-listed prices without endorsing products.Affiliate disclosure
01

What is it?

What it is

2

Valerian products use the roots and underground stems of Valeriana officinalis. Dried herb, extracts and liquids differ in composition; some products combine valerian with other ingredients.

Evidence snapshot6
The 2024 umbrella review found subjective sleep-quality signals, while objective results and insomnia efficacy remained unconvincing overall. Feeling that sleep improved is a different endpoint from measured sleep changes.
02

Names, aliases and forms

Common NamesValerian; Valerian root; Garden valerian; Garden heliotrope; All-heal
Scientific NameValeriana officinalis
03

Mechanisms of action

Mechanism remains uncertain

2

Valerian contains constituents including valerenic acids, but laboratory mechanism hypotheses do not establish a clinical effect. Product preparations vary.

Preparation matters

3

EMA distinguishes particular medicinal root preparations. An extract concentrates selected constituents using a solvent; its milligram amount is not equivalent to the same amount of unextracted root.

04

Potential effects and evidence map

The 2024 umbrella review found subjective sleep-quality signals but no reliable evidence for insomnia across heterogeneous, often low-quality studies. A small product-specific trial reported positive subjective and objective results. These findings support a mixed, preparation-dependent evidence rating rather than a dependable effect across retail products.

Effect domainMagnitudeGrade
Sleep quality6
UnknownConfidence: Low

A reliable sleep-quality benefit has not been established because clinical results vary across preparations and studies.

Note Sleep findings remain inconsistent across preparations and studies.

1/5
C
05

Typical dosages and timing

Typical
300-600 mg/day
Not a recommendation
Lower bound
300 mg
Profile value
Upper bound
600 mg
Profile value
Short-term adult research1300-600 mg/day

NCCIH describes short-term adult use at the displayed range for up to six weeks. This is evidence context, not a universal serving recommendation: root powder, concentrated extracts and liquids are not dose-equivalent. Use the preparation details to interpret any study.

06

Timing & effect horizon

Effect horizonUnknown
Unknown
Study window8Cumulative
8 weeks
Study duration is not effect duration2

Trials use repeated dosing over days or weeks, but a dependable onset, whole-herb The time for blood levels to fall by half during the final elimination phase.Source, duration of benefit or cycling schedule has not been established. The eight-week study window refers to the specific trial below, not a recommended cycle.

07

Safety, side effects and risk profile

Short-term adult risk context1
Ordinary short-term oral use in generally healthy adults appears well tolerated. The minimal base rating does not cover sedating combinations, pregnancy or chronic use. It does not mean zero risk or established long-term safety.
Pregnancy and breastfeeding3
Safety information is inadequate during pregnancy or breastfeeding. EMA advises against its valerian-root medicines in these groups and in children under 12; the adult research summary here should not be extended to children.
Sedation / impairment3
Confidence: Medium

Valerian may affect driving or operating machinery. Avoid using it in situations where drowsiness or impairment would be unsafe.

Note Targeted functional caution; short-term ordinary-dose trials do not establish common clinically meaningful impairment. Not a frequency estimate.

2/5
C
Headache / dizziness2
Confidence: Medium

ODS reports headache and dizziness in trials, with similar complaints also seen with placebo.

Note Reported-effect context, not an individual prediction.

2/5
C
GI discomfort1
Confidence: Medium

NCCIH lists stomach upset among reported effects.

Note Reported-effect context.

1/5
C
Pregnancy / lactation caution1
Confidence: Low

NCCIH says there is not enough information to determine whether valerian is safe during pregnancy or while breastfeeding.

Note Evidence-gap caution, not a finding of harm.

2/5
E
Evidence uncertainty6
Confidence: High

Clinical results vary across valerian preparations and studies, so findings should not be transferred to every retail product.

Note Product form and study quality limit certainty.

3/5
C
driving and machinery3use caution

EMA warns that valerian may affect the ability to drive or operate machinery. This matters even if the product is sold over the counter.

alcohol or sedatives1do not combine

NCCIH says valerian should not be taken with alcohol or sedatives. For other medicines that cause drowsiness, discuss a new valerian product with a clinician or pharmacist.

Reported tolerability effects1

NCCIH reports headache, digestive upset, mental dullness, agitation or uneasiness, and vivid dreams. These reports do not establish how often each occurs.

Long-term and rare-event uncertainty1

Long-term safety remains uncertain. NCCIH notes withdrawal reports after abruptly ending chronic use, and very rare liver-injury reports, often involving multiple herbs. These contexts do not establish a common harm from ordinary short-term use.

08

Legal and regulatory status

U.S. and EU product categories1

As of October 15, 2026, U.S. valerian products may be sold as dietary supplements without FDA premarket approval. EU member states may authorize particular herbal medicines using EMA assessments; that framework does not cover all food supplements or establish worldwide approval. Check the product category and local rules.

09

How it compares

A positive trial is preparation-specific8

One industry-funded trial randomized 80 adults aged 18-50 with mild sleep complaints to placebo or 200 mg/day of a formulation standardized to 2% total valerenic acid for eight weeks. Subjective and several objective measures improved, but 72 completers formed the efficacy analysis; findings need replication and do not validate every retail extract.

10

Practical buying and quality notes

  • Check species, plant part, actual extract mass, solvent and marker disclosure before comparing prices. A stated root-equivalent amount describes starting material, not the mass of extract swallowed. For liquids, volume alone cannot establish milligrams of extract without concentration information.2
  • Some listed normalized prices are zero or rely on inconsistent quantities. Do not interpret these as free product or a best-price result. Verify the merchant package size and serving disclosure, compare the same preparation, and include shipping. A gram of one extract is not necessarily equivalent to a gram of another.2
11

FAQ

Does valerian help at bedtime?

4

AASM issued a weak recommendation against valerian for chronic insomnia in adults in 2017. This reflects limited evidence and does not prove that every preparation has no effect.

Are forms interchangeable?

3

No. Studies and herbal monographs concern particular preparations, so a powder, liquid, tea, tincture, or extract should not be assumed to match another product.

Is valerian a daytime nootropic?

2

Reliable daytime focus or memory enhancement has not been established. Potential drowsiness also makes bedtime marketing a poor basis for choosing a daytime cognitive supplement.

What does an extract standardization claim mean?

2

It states a measured constituent target, such as valerenic acids. ODS notes that no single active constituent is agreed upon, so a higher marker percentage alone does not prove a stronger sleep effect.

12

References

  1. National Center for Complementary and Integrative Health. Valerian: Usefulness and Safety. Last updated May 2025.
  2. National Institutes of Health Office of Dietary Supplements. Valerian Fact Sheet for Health Professionals.
  3. European Medicines Agency. Valerianae radix: herbal medicinal product overview and public assessment summary. Updated March 2026; accessed October 15, 2026.
  4. Sateia MJ, Buysse DJ, Krystal AD, Neubauer DN, Heald JL. Clinical Practice Guideline for the Pharmacologic Treatment of Chronic Insomnia in Adults. J Clin Sleep Med. 2017;13(2):307-349.
  5. Bent S, Padula A, Moore D, Patterson M, Mehling W. Valerian for sleep: a systematic review and meta-analysis. Am J Med. 2006;119(12):1005-1012.
  6. Valente V, Machado D, Jorge S, Drake CL, Marques DR. Does valerian work for insomnia? An umbrella review of the evidence. Eur Neuropsychopharmacol. 2024;82:6-28.
  7. Shinjyo N, Waddell G, Green J. Valerian Root in Treating Sleep Problems and Associated Disorders: A Systematic Review and Meta-Analysis. J Evid Based Integr Med. 2020;25:2515690X20967323.
  8. Shekhar HC, Joshua L, Thomas JV. Standardized Extract of Valeriana officinalis Improves Overall Sleep Quality in Human Subjects with Sleep Complaints. Advances in Therapy. 2024;41:246-261.
Note

This page is informational and summarizes available evidence. It is not medical advice, a recommendation, or a substitute for guidance from a qualified clinician.