Substrate ·evidence-based
interventions / Valerian / sleep

Does Valerian help sleep? (Grade C evidence)

Explore current source-reported research for this exact question. These records are separate from the synthesis below; they do not update its grade or establish a recommendation.

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 other]

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 not reported · Evidence last changed · Open evidence record (version 0)

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
Clinician review
Not yet reviewed by a licensed clinician
Last evidence search
not reported
Last editorial review
not verified

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+) · methodology v1.

Frequently asked

How long does Valerian take to work for sleep?

This record does not report a studied onset time for Valerian and sleep. Do not assume a typical timeframe.

What dose was used in studies of Valerian for sleep?

The recorded studied dose for Valerian and sleep is 300–600 mg. This is a source detail, not a dose recommendation.

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

The recorded studied population is adults with insomnia. This field alone does not show whether deficiency or baseline status changes the effect.

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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Current source-reported research

Membership uses admitted intervention and measured-outcome associations for this exact question. Different populations, preparations, comparators and timepoints remain separate. No pooling or update to the synthesis is asserted.