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Valerian

Valerian

Best for

Fall asleep sooner

Likely strong benefit 200–600 mg/day 2–8 weeks 3 studies, n=477 #2 of 20 studied

Valerian provides a proven strong benefit for adults seeking longer sleep and faster sleep onset, while benefits for overall sleep quality are smaller and less consistent.

Median effective dose, most-studied outcomes

  • Sleep more soundly 530 mg 2–8 wk
  • Ease anxiety symptoms 200 mg 8 wk
  • Fall asleep sooner 200 mg 2–8 wk
Full protocol, 10 outcomes

Risk, worst reported severity

  • Severe complaints (treatment period) severe
  • Moderate complaints (treatment period) moderate
  • midazolam moderate
  • lorazepam moderate
All 11 events and interactions

What valerian actually does

Outcome Effect Evidence Dose Time Rank
Strong benefits 2
Get more sleep each night Proven strong benefit More time asleep can help you meet the amount of sleep you need.
large 		2 RCTs 2 papers · n=477 200–600 mg 2–8 wk #1 /9
Fall asleep sooner Likely strong benefit A shorter wait for sleep can make bedtime feel less frustrating.
large 		3 RCTs 3 papers · n=477 200–600 mg 2–8 wk #2 /20
Modest benefits 2
Sleep that feels more restorative Proven modest benefit Sleep quality reflects whether the night leaves you feeling well rested.
small 		3 meta-analyses 8 papers · n=2.7k — 2–8 wk #1 /34
Stay asleep through the night Proven but unnoticeable Uninterrupted sleep helps the night feel more settled and restorative.
trivial 		2 RCTs 2 papers · n=477 200–600 mg 2–8 wk #3 /15
Worth watching 1
Feel less anxious Large effect, needs confirmation Anxiety can bring persistent worry, unease, and physical tension into ordinary moments.
large 		1 meta-analysis 4 papers · n=176 100–1500 mg 8 wk —
Early research 1
Wake up more refreshed Barely detectable Feeling alert in the morning can make the day easier to start.
trivial 		2 RCTs 2 papers · n=72 200–450 mg 8 wk —

Effect tiers come from native-unit MCID where available, Cohen's d otherwise.

Protocol

Dose, timing & forms

How much

For the strongest outcomes, studies tested 200 to 600 mg of oral valerian preparations for falling asleep sooner and spending more time asleep.12 Sleep-quality research spans a much wider range, from 6.4 to 1,410 mg, largely because investigators used very different products and extract types.1 Most sleep protocols ran for 2 to 8 weeks, so think in terms of a regular trial, not a one-night verdict.12

When and how long

Use valerian as part of a consistent evening routine. The sleep research followed regular daily use for weeks, with many protocols lasting 2 to 8 weeks, so taking it only on the occasional rough night does not match the main evidence base.12 If it leaves you groggy, do not use it before driving, alcohol, or other activities that need quick reactions.4

Forms & standardisation

The best clinical coverage comes from oral valerian root extracts, not from assuming that every tea, tincture, powder, or blend works the same way.1 Look for a label that clearly names valerian root extract and lists the milligrams per serving. Some products list valerenic acids, but the broad range of studied preparations means that no single label marker guarantees the same result seen in trials.13

Studied range, by outcome

Outcome Studied range Median effective Duration Evidence
Sleep more soundly — 530 mg 2–8 wk 8 papers 10 sig. endpoints
Ease anxiety symptoms 100–1,500 mg 200 mg 8 wk 4 papers 5 sig. endpoints
Fall asleep sooner 200–600 mg 200 mg 2–8 wk 3 papers 6 sig. endpoints
Stay asleep through the night 200–600 mg 200 mg 2–8 wk 2 papers 5 sig. endpoints
Spend more time asleep 200–600 mg 200 mg 2–8 wk 2 papers 5 sig. endpoints
Feel alert through the day 200–450 mg 200 mg 8 wk 2 papers 6 sig. endpoints
Support overnight physical recovery 200 mg — 8 wk 1 paper
Support healthy stage N2 sleep 200 mg 200 mg 8 wk 1 paper 1 sig. endpoint
Increase non-REM sleep 200 mg — 8 wk 1 paper
Support healthy REM sleep 200 mg — 8 wk 1 paper

Adverse events and drug interactions

Safety events

Severe complaints (treatment period) severe
Moderate complaints (treatment period) moderate
movement disorder moderate
Mild complaints (treatment period) mild
Alkaline phosphatase increase (CTCAE grade 1) mild
headache mild
gastrointestinal symptoms (nausea, abdominal cramps, diarrhea) mild
drowsiness / daytime somnolence mild

Drug interactions

midazolam moderate increases effect
lorazepam moderate additive
alprazolam minor increases concentration
Buy well

Recommended Valerian products

Real products that dose Valerian where the research does, in a clean formulation, from brands we've audited. We only list ones we'd stand behind.

Chosen for adequate Valerian dosing vs. the studied range, a clean formulation (grade A–C), and independent brand-quality audits. Not sponsored.

In context

What this is and how it works

  • Across 2 studies (n=477), valerian increased nightly sleep duration; native-unit effect and MCID were not reported here.1
  • Fifteen reviewed papers spanned 23 outcomes, with strongest evidence for sleep duration and sleep-onset speed.
  • Sleep-quality improvements were smaller on average than gains in sleep duration or faster sleep onset.1

Valerian comes from the root of Valeriana officinalis, a flowering plant with a famously earthy smell. People have used the dried root and concentrated root extracts as a nighttime herbal supplement for centuries, but modern studies focus on measured oral preparations rather than folklore.14

Valerian's best-known compounds, including valerenic acid, tune the brain's GABA receptors, the same calming signal system that acts like a dimmer switch on overly busy nerve traffic.3 This receptor activity offers a biologically plausible explanation for its sleep effects, although the clinical trials measure sleep outcomes rather than proving one single mechanism explains every result.13

Bottom line

Valerian makes the most sense for adults whose main goal is falling asleep faster or getting more total sleep, especially if they are willing to judge it over a consistent multiweek routine.12 Keep expectations realistic for sleep quality, where the average benefit is smaller. Skip self-experimenting if you use sedating medicines or alcohol, and speak with a clinician or pharmacist first because valerian can add to sedation.4

Frequently asked

Common questions

Does valerian actually help you fall asleep faster?

Yes, the stronger sleep findings show that valerian shortens the time spent awake after you get into bed. The studied oral doses for this outcome ranged from 200 to 600 mg, although products and extracts varied across trials.12

Should you take valerian every night or only when you cannot sleep?

The sleep trials used regular treatment courses lasting 2 to 8 weeks, not occasional rescue use. Give a consistent nightly routine time to show whether it works for you.12

What should you look for in a valerian supplement?

Look for a product that identifies valerian root extract and states the amount per serving. Trial results cannot be assumed to apply to every tea, tincture, powder, or proprietary blend because the studied preparations differed widely.14

Sources

Sources

  1. 1. Valerian for sleep: A systematic review and meta-analysis (2006) ↑
  2. 2. Critical evaluation of the effect of valerian extract on sleep structure and sleep quality (2000) ↑
  3. 3. Valerenic acid is a subunit-selective GABAA receptor modulator (2005) ↑
  4. 4. Valerian: Fact Sheet for Health Professionals

Generated August 27, 2026

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