Valerian Root for Sleep and Anxiety: What the Evidence Shows and Who Should Avoid It
Valerian has been used as a calming herb since ancient Greece. Today it is one of the best-selling herbal sleep aids in the world, sold as capsules, drops and tea, usually with a promise of natural sleep without a morning hangover.
The reality is more modest. Some people clearly feel it helps. In controlled studies the effect is small and inconsistent, and in sleep laboratories it often looks no different from a dummy pill. It is also not free of side effects or interactions, despite being sold next to vitamins.
This guide sets out what valerian is, what the research actually shows for sleep and anxiety, how people use it, who should avoid it, and which options have stronger evidence.
🌿 What valerian is
Valerian, Valeriana officinalis, is a tall plant with pale pink flowers. The part used medicinally is the root, which is dried and ground or extracted. It has a strong, earthy smell that many people compare to old socks. Cats, oddly, love it.
The root contains several active compounds, including valerenic acid. Laboratory studies suggest some of them act on the same calming signalling system in the brain, called GABA, that sleeping tablets and benzodiazepines target, but much more weakly. That weak effect fits what trials find in people.
🔬 What the research shows for sleep
Dozens of trials have tested valerian for insomnia. Taken together, they point to this:
| Question | What studies suggest |
|---|---|
| Do people feel they sleep better? | In some trials, yes, modestly. In others, no better than placebo |
| Does it change measured sleep? | In sleep laboratory studies, little or no difference in how fast people fall asleep or how long they sleep |
| One dose or regular use? | Where benefit appears, it tends to follow two to four weeks of nightly use rather than a single dose |
| Is the evidence strong? | No. Studies are often small, short, and use very different products and doses |
Sleep medicine guidelines reflect this. Specialist societies do not recommend valerian for chronic insomnia, not because it is known to be dangerous, but because the evidence of benefit is too weak to rely on.
That does not mean nobody benefits. Insomnia responds strongly to expectation and routine, and a calming bedtime ritual with a herbal tea can genuinely help some people relax. It simply means valerian should not be expected to fix persistent sleeplessness.
😰 And for anxiety?
The case is weaker still. A few small studies suggest a mild calming effect, but systematic reviews have found too little good evidence to say valerian treats anxiety disorders. For anxiety that affects daily life, treatments with real evidence exist: psychological therapy, and medicines such as Buspar (Buspirone) or certain antidepressants.
💊 How people take it
Doses in studies vary widely, and products differ in how much active material they contain. The amounts below are typical of what has been studied, not a recommendation to self-treat.
| Form | Typical amount used in studies | Timing |
|---|---|---|
| Standardised extract (capsule or tablet) | 300 to 600 mg | 30 minutes to 2 hours before bed |
| Dried root as tea | 2 to 3 g steeped in hot water | An hour before bed |
| Tincture | Varies by product; follow the label | Before bed |
- ⏳ Give it time. If it helps at all, it usually takes two to four weeks of regular use
- 🛑 Keep courses short. Most studies lasted four to six weeks; long-term safety is less studied
- 🏷️ Choose standardised products. Herbal supplements are regulated much more loosely than medicines, and tests have found wide variation in content
- 🚗 Check how you react before driving the next morning
⚠️ Side effects
Short-term use is generally well tolerated. Reported side effects include headache, dizziness, stomach upset, vivid dreams and, in some people, a groggy feeling the next morning, which contradicts the "no hangover" claim often made on packaging. A few people feel restless rather than calm.
There are rare reports of liver injury linked to valerian, often in products that combined it with other herbs. Stop it and seek advice if you notice yellowing of the skin or eyes, dark urine or unexplained tiredness and nausea.
After long use at high doses, stopping suddenly has occasionally been followed by withdrawal-like symptoms such as anxiety and a racing heart. Tapering off is sensible after prolonged use.
🚫 Who should avoid it
🔴 Avoid valerian, or ask a pharmacist or doctor first, if you:
- are pregnant or breastfeeding — safety has not been established
- are giving it to a young child
- take sleeping tablets, benzodiazepines, opioid painkillers, sedating antihistamines or other sedating medicines — effects add up
- drink alcohol in the evening — the combination increases drowsiness and impairment
- have liver disease
- have surgery planned — stop about two weeks beforehand and tell the anaesthetist
📋 Common combinations
Valerian is often sold mixed with hops, lemon balm or passionflower. These combinations have a similarly weak evidence base: some small positive studies, nothing conclusive. One herb deserves a clear warning. Kava, sometimes included in "relaxation" blends, has been linked to serious liver damage and is restricted in several countries. It is best avoided.
⚖️ Valerian, melatonin and other options
| Option | Evidence | Best suited to |
|---|---|---|
| Cognitive behavioural therapy for insomnia | Strongest of all; benefit lasts after treatment ends | Anyone with long-term insomnia |
| Melatonin | Modest but consistent effect on falling asleep | Adults over 55, jet lag, a naturally late body clock |
| Valerian | Weak and inconsistent | People who prefer a herbal option and accept uncertain benefit |
| Sedating antihistamines | Tolerance within days, next-day grogginess | Occasional short-term use only; best avoided in older people |
| Prescription sleeping tablets | Effective short term, with dependence risk | Short courses under medical supervision |
Melatonin is available in our sleep aids category as Restfine (Melatonin). We do not currently stock valerian. The techniques of cognitive behavioural therapy for insomnia, and the reasons ordinary insomnia is less dangerous than it feels, are covered in our guide to insomnia and its causes.
🔍 When poor sleep is something else
Herbal remedies are a reasonable thing to try for occasional sleeplessness. They are the wrong answer when poor sleep has a medical cause that needs treating:
- Sleep apnoea
- Loud snoring, pauses in breathing and unrefreshing sleep. Sedating remedies can make it worse. See our guide to sleep apnoea.
- Depression and anxiety
- Early waking and racing thoughts at night are often the first sign. Treating the cause improves sleep.
- Restless legs
- An urge to move the legs in the evening, often linked to low iron.
- Pain, reflux, frequent night-time urination
- All fragment sleep and respond to their own treatments.
- Medicines and caffeine
- Some antidepressants, steroids, decongestants and late-afternoon coffee keep people awake.
🌙 Habits that work better than any herb
A fixed wake-up time every day, including weekends, anchors the body clock more powerfully than any bedtime routine. Getting out of bed after a long spell of frustrated wakefulness, and returning only when sleepy, retrains the brain to link bed with sleep. Daylight in the morning, no caffeine after early afternoon, and alcohol kept well away from bedtime complete the basics. They sound simple. Together they outperform most sleep aids.
📞 When to see a doctor
- Insomnia lasting more than three months, or affecting work, mood or driving
- Loud snoring with pauses in breathing
- Falling asleep during the day while driving or at work
- Low mood or anxiety alongside poor sleep
- Yellowing skin or eyes, or dark urine while taking valerian — stop and seek advice promptly
- Taking valerian with other sedating medicines — ask a pharmacist first
❓ Frequently asked questions
Does valerian root actually work for sleep?
The evidence is weak and inconsistent. Some people report sleeping better, especially after two to four weeks of nightly use, but in sleep laboratory studies valerian often performs no better than placebo. Sleep medicine guidelines do not recommend it for chronic insomnia.
How long does valerian take to work?
Where a benefit has been seen, it usually appeared after two to four weeks of regular use rather than after a single dose. Taken occasionally, it is unlikely to make a noticeable difference.
How much valerian do people take?
Studies have typically used 300 to 600 mg of a standardised extract, or 2 to 3 g of dried root as tea, taken 30 minutes to 2 hours before bed. Products vary widely in strength, so follow the label and keep courses short.
Can I take valerian with alcohol?
It is best not to. Both cause drowsiness, and together they increase sedation and impairment, which matters for driving and for older people at risk of falls.
Is valerian safe to take every night?
Short courses of four to six weeks are generally well tolerated. Long-term safety is less studied, rare liver injury has been reported, and stopping after prolonged high doses has occasionally caused withdrawal-like symptoms, so tapering is sensible.
Is valerian better than melatonin?
They work differently, but melatonin has more consistent evidence, particularly for falling asleep in adults over 55, for jet lag and for a naturally late body clock. Valerian's evidence is weaker. Neither matches cognitive behavioural therapy for long-term insomnia.
Does valerian help anxiety?
There is too little good evidence to say it treats anxiety disorders. For anxiety that affects daily life, psychological therapy and medicines such as buspirone or certain antidepressants have much stronger evidence.
Can valerian be taken in pregnancy?
It is not recommended, because its safety in pregnancy and breastfeeding has not been established. Sleep problems in pregnancy are best discussed with the midwife or doctor.
What are the side effects of valerian?
Headache, dizziness, stomach upset, vivid dreams and sometimes next-morning grogginess. Rarely, liver injury has been reported. It adds to the effect of alcohol and sedating medicines.
Should I stop valerian before surgery?
Yes. Stop it about two weeks before planned surgery and tell the anaesthetist you have been taking it, because it may add to the effects of anaesthetic and sedating drugs.
📑 Sources and editorial
- Systematic reviews and meta-analyses of valerian for insomnia and anxiety
- Clinical practice guideline for the pharmacological treatment of chronic insomnia
- Herbal medicine monographs on valerian root: dosage, safety and interactions
- Case reports of liver injury associated with valerian-containing products
- Regulatory safety information on kava
- Guidelines recommending cognitive behavioural therapy as first-line treatment for insomnia
- Related reading: insomnia and its causes, sleep apnoea
- Related products: Restfine (Melatonin), Buspar (Buspirone)
- RXshop Editorial Team — reviewed by Sarah Mitchell, PharmD
Medical Disclaimer: The information in this article is for educational and informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek guidance from a qualified healthcare provider with any questions you may have regarding a medical condition, and before starting, stopping or changing any medication.