Valerian Root for Anxiety: Weak Evidence, Safety Concerns, and Alternatives

Quick answer: Valerian root (Valeriana officinalis, the underground stem and rhizome) is a traditional herbal supplement marketed for sleep and mild anxiety. Evidence for anxiety is weak and inconclusive per a 2006 Cochrane systematic review (Miyasaka). A small 2002 trial (Andreatini et al.) in generalized anxiety disorder showed modest improvement, but larger, well-designed trials are lacking. Evidence for sleep is slightly stronger. Typical doses: 400-900 mg extract before bed for sleep, or 120 mg three times daily for anxiety (from small trials only, not proven doses). Safety concerns include rare but documented hepatotoxicity (liver injury), sedative drug interactions, contraindication before surgery, and insufficient pregnancy safety data. Valerian is not a proven anxiety treatment. Consult your doctor before use, especially if you have liver disease, take sedatives or benzodiazepines, have surgery scheduled, are pregnant, or breastfeeding.

If you are in crisis, call or text 988 (US Suicide and Crisis Lifeline), call 111 option 2 (NHS, UK), or visit https://findahelpline.com for international resources.

Important: Valerian is a dietary supplement, not a medicine

Valerian root is sold as a dietary supplement in the US, is not FDA-regulated for anxiety like medications, and is not a substitute for cognitive behavioral therapy (CBT), medications (SSRIs, SNRIs, benzodiazepines), or other evidence-based treatments for anxiety disorders. The evidence for valerian in anxiety is inconclusive and weak, based on very small clinical trials of 4-12 weeks. The 2006 Cochrane systematic review (Miyasaka) concluded that there is insufficient evidence to recommend valerian for anxiety. Valerian has not been studied as a treatment for panic disorder, generalized anxiety disorder clinical diagnosis, or severe anxiety. Valerian is used more commonly for sleep than anxiety. Consult a healthcare provider before use, particularly if you have liver disease, take sedatives or benzodiazepines, have scheduled surgery, are pregnant or breastfeeding, or take prescription medications.

What valerian root is

Valerian refers to several species, but Valeriana officinalis is most commonly studied and used in supplements.

Valerian root is actually the underground stem and rhizome (root system) of the plant. It has been used in traditional European medicine and Traditional Chinese Medicine for centuries, valued for supporting rest and nervous system calm.

The root material is typically dried and processed into capsules, liquid extracts, tinctures, or brewed as a tea. The plant has a characteristic strong, somewhat unpleasant odor, often described as earthy or musty, which is why capsule forms are popular.

The active compounds in valerian include:

Valerenic acid: A sesquiterpene thought to interact with GABA-A receptors and possibly adenosine A1 receptors, producing mild sedative effects.
Valepotriates: Compounds that may have anxiolytic (anxiety-reducing) properties in theory, though human evidence is limited.
Other alkaloids and phenolic compounds: Contributing to overall CNS (central nervous system) effects.

The exact mechanism is not fully understood in humans. Research suggests GABAergic modulation (similar to benzodiazepines, but much weaker) and possible adenosine receptor activity, but effects have not been conclusively proven at clinical doses.

Source: Bent et al. 2006 meta-analysis (sleep), NCCIH, NIH Office of Dietary Supplements.

The evidence: what research actually shows

The evidence for valerian in anxiety is sparse and inconclusive. Here is an honest summary:

Cochrane 2006 systematic review (Miyasaka et al., anxiety)

Scope: Comprehensive systematic review of valerian for anxiety disorders.
Conclusion: "There is not enough evidence to draw firm conclusions about the efficacy of valerian for anxiety disorders."
Basis: Review identified very few randomized controlled trials (RCTs) testing valerian specifically for anxiety. Most studies were small, of short duration (4-12 weeks), and methodologically weak.
Bottom line: Insufficient evidence. Cannot recommend valerian for anxiety.

Andreatini 2002 RCT (small GAD trial)

Design: 40 adults with generalized anxiety disorder, randomized to valerian extract 150 mg three times daily or placebo for 4 weeks.
Results: Modest improvement in anxiety scores in the valerian group compared to placebo. Reduction described as "modest" not dramatic.
Limitations: Very small sample (40 subjects), extremely short duration (4 weeks, most studies require 8+ weeks), single study, no head-to-head comparison to SSRIs or CBT, no follow-up on durability.

Fernandez-San-Martin 2010 meta-analysis (sleep, not anxiety)

Scope: 19 RCTs of valerian for sleep.
Conclusion: Modest subjective improvement in sleep quality; objective sleep measures (polysomnography) showed smaller effects.
Relevance to anxiety: Sleep and anxiety often overlap. Better evidence for sleep than anxiety, but still modest.

Bent 2006 meta-analysis (sleep)

Scope: 16 RCTs of valerian for insomnia.
Conclusion: Mixed results. Some improvement in sleep quality subjectively, but objective measures less clear.
Limitations: Heterogeneous studies, publication bias likely (small positive studies published, negative studies not), dose variability.

Important caveats

Anxiety-specific evidence is minimal: only Andreatini 2002 (n=40, 4 weeks) and scattered mentions in broader reviews.
Sleep evidence is slightly stronger but still modest.
All studies use high heterogeneity in valerian preparation, dose, and duration.
Duration is typically 4-12 weeks; no long-term safety data.
No head-to-head comparisons with SSRIs, benzodiazepines, or CBT.
Effect sizes are modest at best.
Measures are subjective (self-reported anxiety or sleep), not objective clinical outcomes.

Bottom line: Valerian root has inconclusive, weak evidence for anxiety. The 2006 Cochrane review found insufficient evidence to recommend it. One small 4-week trial showed modest benefit, but this is insufficient to establish efficacy. Evidence for sleep is slightly stronger. Larger, well-designed trials are needed. Valerian is not a proven anxiety treatment.

How valerian may work (mechanisms not proven in humans)

Research suggests several theoretical mechanisms:

GABA-A receptor modulation: Valerenic acid, the primary active compound, is thought to interact weakly with GABA-A receptors, similar to benzodiazepines. However, the binding is much weaker than benzodiazepines, and human evidence at clinical doses is lacking. Most research is from cell culture or animal studies.
Adenosine A1 receptor activity: Some research suggests valerian may influence adenosine A1 receptors, which are involved in sleep-wake regulation. This could explain sedative effects better than anxiety relief. Evidence is preliminary.
Other mechanisms: Valerian may influence serotonin, histamine, and other neurotransmitters, but human evidence is sparse.

These mechanisms are plausible but not firmly established in humans. The brain has tight neurotransmitter regulation, and herbal compounds may not reliably cross the blood-brain barrier or produce measurable effects at clinical doses.

Source: Bent et al. 2006, NCCIH, NIH ODS.

Forms, standardization, and dosage

Valerian is available in multiple forms:

Valerian tea (brewed root)

Typical content: Variable; depends on brew strength and plant quality. Concentration highly unpredictable.
Preparation: Dried root steeped 5-10 minutes in hot water.
Pros: Traditional, inexpensive, no pill burden.
Cons: Characteristic unpleasant taste and smell, variable potency, lower dose than extracts.
Research backing: Limited direct evidence; most RCTs used extracts or tinctures.

Standardized extract capsules

Standardization: Often standardized to valerenic acid content (0.8-1.2% typical).
Typical dose: 400-900 mg for sleep, 120 mg three times daily for anxiety (from Andreatini 2002).
Pros: Consistent dose, more potent than tea, easier to take.
Cons: Variable standardization across brands, higher cost, pill burden.
Research backing: Most RCTs used extracts in capsule form.

Tinctures and liquid extracts

Potency: Variable, solvent-dependent.
Dosing: Typically 1-2 ml (30-60 drops) per dose.
Research backing: Limited; most RCTs use dried extracts or capsules.
Note: Alcohol-based tinctures may interact with sedatives.

Typical doses used in research

Research trials used the following doses:

Andreatini 2002 (anxiety): 150 mg three times daily (450 mg total) for 4 weeks.
Bent 2006 (sleep meta-analysis): 400-900 mg extract before bed, variable across studies.
Fernandez-San-Martin 2010 (sleep meta-analysis): 400-900 mg per dose.

There is no proven "anxiety treatment dose" of valerian established in clinical practice. The anxiety dose (120-450 mg daily) comes from one small 4-week trial only and is not validated.

For self-use (if approved by doctor):

For sleep: 400-900 mg extract 1-2 hours before bed.
For anxiety: 120-450 mg daily (no proven dose; based only on Andreatini 2002).
Onset: May take 2-4 weeks for sleep benefit; anxiety response unclear.

Safety profile and adverse effects

Valerian has been used for centuries, but documented safety concerns exist.

Hepatotoxicity (liver injury, rare but documented)

Risk: Case reports of liver injury (hepatotoxicity) associated with valerian use. NIH LiverTox database documents rare but confirmed cases.
Mechanism: Unknown; possibly idiosyncratic reaction or direct hepatotoxin.
Symptoms: Jaundice (yellowing of skin and eyes), dark urine, right upper quadrant abdominal pain, nausea, loss of appetite.
Frequency: Rare (case reports, not common), but real.
Who is at risk: People with pre-existing liver disease may be at higher risk. Susceptible individuals may develop hepatotoxicity unpredictably.
Action: If symptoms of jaundice, dark urine, or right-sided abdominal pain develop, stop valerian immediately and see a healthcare provider. Liver function tests (LFTs) should be obtained.
Monitoring: For long-term use (>4 weeks), baseline liver function tests may be warranted; repeat if symptoms develop.
Source: NIH LiverTox database, case reports in medical literature.

Sedation and morning hangover

Risk: Valerian is sedating and can cause drowsiness, particularly at higher doses.
Symptoms: Drowsiness, next-day grogginess, impaired cognition, slow reaction time.
Frequency: Common with high doses; mild with lower doses.
Who is at risk: People sensitive to sedation; elderly; those taking other sedating medications.
Action: Take valerian in the evening only. Do not drive or operate machinery if drowsy. Start with lower doses (300-400 mg).

Drug interactions (sedatives, benzodiazepines, alcohol, opioids)

Risk: Additive sedation and CNS depression when combined with benzodiazepines, z-drugs (zolpidem), barbiturates, opioids, antihistamines, or alcohol.
Mechanism: All are CNS depressants; combined effects potentiate.
Symptoms: Excessive drowsiness, impaired cognition, ataxia (loss of coordination), respiratory depression (in extreme cases).
Who is at risk: People taking benzodiazepines (alprazolam, diazepam), z-drugs (zolpidem, zaleplon), opioids (codeine, morphine), barbiturates, alcohol regularly.
Action: Inform your doctor if using valerian alongside sedatives. Do not increase doses without medical supervision. Do not drive or operate machinery if sedated.
CYP3A4 interaction: Valerian is a CYP3A4 substrate and possible inhibitor. May affect metabolism of certain medications (statins, some SSRIs, calcium channel blockers). Clinical significance unclear but possible.

Pre-surgical consideration

Risk: Valerian may have additive sedative effects with anesthesia. Combined with intraoperative benzodiazepines and other agents, excessive sedation or respiratory depression could occur.
Action: Discontinue valerian 1-2 weeks before scheduled surgery. Inform anesthesiologist of valerian use.
Source: NCCIH, general surgical safety guidelines.

Common side effects

Frequency: Mild, reported in 3-10% of users.
Most common: Headache, dizziness, next-day drowsiness, upset stomach, nausea.
Onset: Usually within first 1-2 weeks.
Management: Take with food, start with lower doses, increase gradually. Most resolve within 2-4 weeks.

Rare side effects

Liver injury (hepatotoxicity): Documented case reports (see above). Rare but real.
Excessive sedation: At high doses.
Gastrointestinal upset: Nausea, stomach pain, diarrhea.
Allergic reactions: Rash, itching (rare).

Pregnancy and breastfeeding

Pregnancy: Safety data are insufficient. Valerian is not recommended during pregnancy without medical clearance. Traditional use in some cultures, but clinical evidence is lacking.
Breastfeeding: Limited data. Valerian compounds may pass into breast milk. Avoid without medical guidance.
Recommendation: Pregnant or breastfeeding women should avoid valerian supplements until more safety data exist. Consult obstetrician or pediatrician.

Children

Safety: Not studied in children. Medicinal doses not recommended.
Recommendation: Consult pediatrician before using valerian in children.

Who should NOT use valerian

Do not use valerian without medical clearance if you have:

Liver disease: Hepatotoxicity risk documented. Baseline and periodic liver function tests recommended.
Taking sedatives, benzodiazepines, barbiturates, opioids, or alcohol regularly: Risk of additive sedation and CNS depression.
Scheduled surgery: Stop 1-2 weeks before (anesthesia interaction).
Pregnancy or breastfeeding: Insufficient safety data; avoid.
Children: Not studied; consult pediatrician.
Driving or operating machinery: Valerian causes drowsiness; avoid before these activities.

How to use valerian IF your doctor approves

Form selection: Standardized extract capsule (0.8-1.2% valerenic acid) preferred over tea for consistency.
Start low: 300-400 mg in evening, assess for 1-2 weeks.
Dose escalation: If tolerated, increase gradually to 400-900 mg for sleep or 120-450 mg daily (split into 40-150 mg three times daily) for anxiety.
Duration: Most studies are 4-12 weeks. Assess at 4 weeks; if no benefit by 8 weeks, valerian may not work for you.
Liver monitoring: For long-term use, baseline liver function tests (LFTs) at start; repeat if symptoms of jaundice, dark urine, or abdominal pain develop.
Stop if: Hepatotoxicity symptoms (jaundice, dark urine, right-sided pain), excessive sedation, worsening anxiety, or other adverse effects.

Valerian compared to clinical treatments and alternatives

Valerian is vastly different from evidence-based anxiety treatments:

Proof level: Valerian evidence is inconclusive (Cochrane 2006). SSRIs and CBT are high-grade evidence for anxiety disorders.
Effect size: One small trial (Andreatini 2002) showed modest improvement; SSRIs show 50-60% anxiety reduction.
Indication: Valerian is studied only for mild anxiety in very small trials. SSRIs and CBT are proven for panic disorder, GAD, social anxiety, agoraphobia.
Relapse: No long-term follow-up data on valerian; SSRIs relapse rate 30-50% without continued therapy.
Safety profile: Valerian has documented hepatotoxicity risks; SSRIs have better-characterized side effect profiles.
Adjunct role: Valerian may be used for mild, subclinical anxiety or sleep-related anxiety only, with doctor approval. It is NOT a first-line or standalone treatment for diagnosed anxiety disorder.

FAQ

Does valerian really help with anxiety?

Evidence is inconclusive and weak. The 2006 Cochrane systematic review found insufficient evidence to recommend valerian for anxiety. One small 4-week trial (Andreatini 2002) showed modest improvement, but this is not enough to establish effectiveness. Valerian is better studied for sleep than anxiety. If you have diagnosed anxiety disorder, professional treatment (therapy, medication) is indicated.

How long does valerian take to work?

For sleep, 2-4 weeks of consistent use may be needed before benefit emerges. For anxiety, the evidence is minimal; the small trial used 4 weeks and showed modest improvement, but onset is unclear. Valerian is not acute like benzodiazepines; effects develop gradually.

Valerian vs chamomile vs ashwagandha for anxiety: which is better?

All three have modest to weak evidence, but differ in mechanism, evidence strength, and safety concerns.

Valerian: Inconclusive evidence (Cochrane 2006), sedating, hepatotoxicity risk documented, more studied for sleep than anxiety.
Chamomile: Moderate evidence (Amsterdam 2009 RCT), less sedating than valerian, ragweed allergy cross-reactivity, warfarin interaction risk.
Ashwagandha: Stronger evidence base (more RCTs), adaptogenic mechanism, documented thyroid and liver risks, pregnancy contraindication.

Bottom line: None are proven anxiety treatments. Chamomile has the most research and is safer than valerian. Ashwagandha has more evidence but more side effects. Valerian is least studied for anxiety specifically. Consult your doctor.

Can I take valerian every night long-term?

Most studies are 4-12 weeks; no long-term safety data exist beyond 38 weeks (like chamomile). Hepatotoxicity is rare but documented. For long-term use, baseline and periodic liver function tests are recommended. Consider cycling (8 weeks on, 2 weeks off). Consult your doctor for personalized duration guidance.

Is valerian safe long-term?

No long-term safety data exist. Hepatotoxicity case reports are documented (rare but real). Sedation and next-day grogginess are common with daily use. For long-term use beyond 4-8 weeks, baseline and periodic liver function tests are warranted. Consult your doctor before using valerian daily for extended periods.

Can I take valerian with melatonin or other sleep medications?

Valerian combined with melatonin may cause additive sedation. Combined with prescription sleep medications (zolpidem, zaleplon), benzodiazepines, or barbiturates, significant CNS depression risk exists. Inform your doctor of all supplements and medications before combining. Do not drive or operate machinery if overly sedated.

Does valerian cause liver damage?

Hepatotoxicity is rare but documented in case reports (NIH LiverTox database). Most people do not develop liver injury from valerian. However, susceptible individuals may. If symptoms of jaundice, dark urine, or right upper quadrant abdominal pain develop, stop valerian immediately and seek medical evaluation. Liver function tests may be warranted for long-term use.

Can I drive after taking valerian?

No. Valerian is sedating and can impair alertness, reaction time, and cognition. Do not drive or operate machinery after taking valerian, especially when starting or increasing dose. Take valerian in the evening only, when you do not need to be alert.