herb · for poor sleep quality
Valerian
Acts on your brain’s calming system to lengthen deep sleep and shorten the wait to nod off.
Say that in clinical terms
Increases slow-wave sleep duration and reduces sleep latency through GABAergic mechanisms.
How strong is the research?
In 405 adults with insomnia, two weeks of valerian did not improve the main thing the trial measured.
2 papers read, 1 supporting, 1 against.
Who was studied: Studied in people with diagnosed insomnia, median age 49 — narrower than someone just sleeping badly.
How much to take
before bed
400–900 mg
Improves subjective sleep quality without morning grogginess.
Before you take it
- CNS depressant potentiation: additive sedation with benzodiazepines, barbiturates, opioids, antihistamines, and alcohol; NIH ODS specifically notes additive effect with kava and melatonin.
- Avoid during pregnancy and lactation — safety not established in either population.
- Not established safe in children under 3 years — insufficient data.
- Potential in vitro inhibition of CYP3A4; clinical significance at typical oral doses in humans is unconfirmed but cannot be excluded for drugs with narrow therapeutic windows.
- Abrupt discontinuation after prolonged daily use: rare case reports of withdrawal-like symptoms (tachycardia, agitation, rebound insomnia); evidence is limited to isolated case reports.
- Rare case reports of hepatotoxicity involving multi-herb combination products containing valerian; causal attribution to valerian alone has not been established in any report.
- Morning grogginess reported in at least one clinical study at the 900 mg dose.
- No NIH ODS Tolerable Upper Intake Level (UL) established — valerian is an herbal supplement, not a micronutrient; the UL framework does not apply.
What we make of it
Sixteen patients, and the objective sleep measures moved less than how people said they felt.
The detail
The study is a proper crossover trial, but in only 16 people with diagnosed insomnia, and it is not the pooled analysis we labelled it. Sleep-lab recordings did show some benefit after two weeks — less time awake in the night, less light sleep — though the pattern was mixed.