Substrate ·evidence-based
interventions / Valerian / sleep

Does Valerian help sleep? (Grade C evidence)

Grade C for Valerian on sleep: weak but non-null signal, low certainty; do not expect a large effect, especially in adults with insomnia. Studied dose 300–600 mg.

Exact question reviewed

Population
adults with insomnia
Intervention
Valerian · 300–600 mg
Comparator
not reported
Outcome
sleep
Time horizon
not reported

Bottom line. Grade C for Valerian on sleep: weak but non-null signal, low certainty; do not expect a large effect, especially in adults with insomnia. Studied dose 300–600 mg. [2 RCTs]

Direction
benefit
Magnitude
evidence is genuinely mixed: some low-quality trials report small improvements in subjective sleep quality, but the most rigorous reviews find no significant difference from placebo. Considered safe; not reliably effective.
Grade
C
Certainty
low
Clinical meaning
small but potentially useful
Who it applies to
adults with insomnia
Dose / form studied
300–600 mg
Safety
not assessed
The one limitation
Claim-specific limitation details are not available in this public record.

Reviewed · Evidence last changed · Claim clm_ec_val_sleep v0

Grade
C
what does the grade mean?
Certainty
low
what does certainty mean?

Grade C / low: hints of benefit in small trials; a well-run RCT could easily push this to B or to null.

Who it works for

Best-studied in adults with insomnia. Recorded studied dose: 300–600 mg.

Evidence

StudyDesignRoleCite
Valerian for sleep: a systematic review and meta-analysispeer-reviewednot classifiedPMID:17145239
A systematic review of valerian as a sleep aid: safe but not effectivepeer-reviewednot classifiedPMID:17517355

Why this grade

Reasoning trace

The current record stores Grade C at low certainty and links 2 publishable sources. A claim-specific domain-by-domain grading rationale is not available in this public record, so no reason for upgrading or downgrading is inferred here.

Audit and version

Claim ID
ec_val_sleep
Claim version
not reported
Governance
legacy, not verified
Last evidence search
not reported
Last editorial review
2026-07-16T07:08:29.044Z

Public receipt · Machine-readable claim · Methodology

Dose & form

Studied intake: 300–600 mg.

People say · Evidence shows

“valerian is a natural sleeping pill”

Evidence: Grade C — evidence is genuinely mixed: some low-quality trials report small improvements in subjective sleep quality, but the most rigorous reviews find no significant difference from placebo. Considered safe; not reliably effective..

How it stacks up for sleep

Grade history

Re-review cadence: every 6 months (Grade C+) · next scheduled by · methodology v1.

Frequently asked

How long does Valerian take to work for sleep?

Trials of Valerian for sleep typically report effects within 2–4 weeks, though individual response varies. Studies rarely find benefit inside 1 week for chronic outcomes.

What dose was used in studies of Valerian for sleep?

Studied doses for Valerian in sleep trials cluster around 300–600 mg. See the dose block for the specific range and how it varies by form.

Does Valerian work for sleep if I'm not deficient?

The effect concentrates in adults with insomnia. If your baseline is normal, expect a smaller effect than the trial averages.

Valerian or the next-best alternative for sleep?

See the compare block above for the head-to-head with the most-cited alternative. Grade + certainty differences matter more than any single trial.

Related

What this is — and is not

Evidence description
evidence is genuinely mixed: some low-quality trials report small improvements in subjective sleep quality, but the most rigorous reviews find no significant difference from placebo. Considered safe; not reliably effective.
Substrate's interpretation
The current reviewed record assigns Grade C at low certainty. A domain-by-domain rationale is shown only when recorded.
Discuss with a clinician
If you're on medication or have a condition that changes the calculus, bring the interaction & population blocks above to your pharmacist or prescriber before deciding.
Individualized medical advice
Not provided here or on any Substrate surface (API, agent tool, embed) — see YMYL policy.

Cite this page

Citation is encouraged. The proposed reuse license is CC-BY-4.0; status: pending-governance-ratification.

Plain-text citation
Substrate. Does Valerian help sleep? (Grade C). https://evidencebased.info/interventions/valerian/sleep. Updated 2026-07-16.
BibTeX
@misc{substrate_entionsvaleriansleep,
  author = {Substrate editorial},
  title  = {Does Valerian help sleep?},
  year   = {2026},
  url    = {https://evidencebased.info/interventions/valerian/sleep},
  note   = {Grade C, evidencebased.info}
}

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