Chamomile for Anxiety: Evidence-Based Review, Dosage, and Safety

Quick answer: Chamomile (Matricaria chamomilla, German chamomile) is a traditional herbal remedy with moderate evidence for reducing mild-to-moderate generalized anxiety disorder symptoms. A 2009 Penn RCT (Amsterdam et al.) found that 1500 mg daily of standardized extract (1.2% apigenin) reduced Hamilton Anxiety Rating Scale scores over 8 weeks. Chamomile is generally well tolerated, with a long history of safe use in tea. However, it carries documented risks: cross-reactivity with ragweed allergies, interaction with warfarin (increased bleeding risk, case reports documented), and insufficient pregnancy safety data. It is not a substitute for cognitive behavioral therapy or medication. Consult your doctor before use, especially if you have ragweed allergies, take warfarin, or are pregnant.

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: Chamomile is a dietary supplement or herbal tea, not a medicine

Chamomile is sold as a dietary supplement and herbal tea 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 chamomile in mild anxiety is moderate, based on small clinical trials of 8-38 weeks. It has not been studied as a treatment for panic disorder, generalized anxiety disorder (clinical diagnosis), or severe anxiety. Chamomile is best understood as a mild adjunct for subclinical stress or as a pleasant tea for relaxation, not a clinical intervention. Consult a healthcare provider before use, particularly if you have ragweed allergies, take warfarin or other anticoagulants, are pregnant or breastfeeding, or take prescription medications.

What chamomile is

Chamomile refers to two species: German chamomile (Matricaria chamomilla) and Roman chamomile (Chamaemelum nobile). German chamomile is the species most studied for anxiety and is the focus of this article.

Chamomile has been used in traditional medicine for centuries, particularly in European and Middle Eastern herbal practices. The flower buds are dried and brewed as tea or processed into capsules, tinctures, and extracts.

The active compounds in German chamomile include:

Apigenin: A flavonoid that binds weakly to benzodiazepine receptor sites on GABA-A receptors, thought to produce mild anxiolytic (anxiety-reducing) effects.
Bisabolol and chamazulene: Additional compounds with potential anti-inflammatory and antispasmodic properties.

The apigenin content varies widely in chamomile tea (typically 50-90 mg per cup, variable) but is standardized in clinical-grade extracts (1.2% apigenin) used in research.

Source: Srivastava et al. 2010 systematic review, NCCIH, NIH Office of Dietary Supplements.

The evidence: what research actually shows

Several randomized controlled trials (RCTs) have tested chamomile for anxiety. Here is an honest summary:

Amsterdam 2009 RCT (Penn State, generalized anxiety disorder)

Design: 61 adults with mild-to-moderate generalized anxiety disorder, randomized to standardized chamomile extract (1.2% apigenin) or placebo. Dosing: 220 mg per capsule, 1-5 capsules daily (up to 1500 mg), for 8 weeks.
Results: Chamomile group showed significant reduction in Hamilton Anxiety Rating Scale (HAM-A) scores compared to placebo. Clinically meaningful anxiolytic effect observed.
Limitations: Small sample (61 subjects), short duration (8 weeks), single research group (Penn). No comparison to SSRIs or CBT. Industry-funded (Natrol, Inc.).

Mao 2016 RCT (Penn State, long-term safety and relapse)

Design: 38 adults with generalized anxiety disorder, randomized to chamomile extract 1500 mg daily or placebo for 38 weeks (long-term follow-up).
Results: Chamomile group maintained anxiety reduction. No dependence or discontinuation syndrome noted. However, relapse rates were high when chamomile was discontinued (53% vs 27% placebo in follow-up period).
Limitations: Very small sample (38 subjects), single research group, industry-funded. High relapse after stopping suggests benefit may be temporary.

Amsterdam 2012 RCT (Penn State, GAD with comorbid depression)

Design: Chamomile for generalized anxiety disorder with concurrent depression.
Results: Improvements in both anxiety and depressive symptoms.
Limitations: Small study, short duration, single site.

Keefe 2016 systematic review

Scope: Review of chamomile evidence for anxiety.
Conclusion: Consistent but modest anxiolytic effect in generalized anxiety disorder. Effect size small to moderate.

Srivastava 2010 systematic review

Scope: Chamomile for anxiety and sleep.
Conclusion: Traditional use supported by limited clinical evidence. Mechanisms involve apigenin-GABA receptor interaction, though human evidence is weak.

Important caveats

Most studies have sample sizes under 100 people (many under 75).
Duration is typically 8-38 weeks; no long-term safety data beyond this.
All major studies come from a single research group at Penn State (potential bias).
Industry-funded by supplement manufacturers.
Effect sizes are modest, not equivalent to SSRIs (which show 50-60% symptom reduction in anxiety disorders).
Measures are subjective (self-reported anxiety), not objective clinical outcomes.
Participants typically have "mild-to-moderate" GAD, not severe anxiety disorder.
No head-to-head comparison with CBT, SSRIs, benzodiazepines, or other anxiety treatments.

Bottom line: Chamomile may reduce anxiety symptoms in mild-to-moderate generalized anxiety over 8 weeks. Evidence is moderate, not high-grade. It is not proven effective for panic disorder, severe anxiety, or clinical anxiety disorders requiring professional treatment. Relapse risk is high after stopping.

How chamomile may work (mechanisms not proven in humans)

Research suggests several theoretical mechanisms:

GABA-A receptor binding: Apigenin, the primary active compound, binds weakly to benzodiazepine receptor sites on GABA-A receptors. This is the same mechanism as benzodiazepine drugs (e.g., diazepam), but apigenin binds much more weakly, producing milder effects. Evidence is from cell culture and animal studies, not proven in humans at clinical doses.
5-HT1A modulation: Some research suggests apigenin may influence serotonin 5-HT1A receptors, similar to buspirone (an anti-anxiety medication). Human evidence is limited.
Anti-inflammatory effects: Chamomile contains compounds with anti-inflammatory properties. Inflammation is implicated in anxiety and depression, though the clinical relevance is unclear.
General relaxation: The sensory experience of drinking warm chamomile tea (ritual, placebo, comfort) contributes to perceived anxiolytic effect independent of pharmacology.

These mechanisms are plausible but not firmly established in humans. The brain tightly regulates neurotransmitters and hormones, and herbal compounds may not reliably cross the blood-brain barrier or produce measurable clinical effects.

Source: Srivastava et al. 2010, Keefe et al. 2016.

Forms: tea vs extracts, standardization, and dosage

Chamomile is available in multiple forms, each with different potency and research backing:

Chamomile tea (traditional, lowest dose)

Typical content: 50-90 mg flavonoids per cup, apigenin content highly variable (5-20 mg estimate).
Preparation: Dried flowers steeped 5-10 minutes in hot water.
Pros: Pleasant taste, low cost, minimal side effects, long cultural history of safe use, convenient.
Cons: Variable potency, lower total apigenin dose than studied extracts, effect on clinical anxiety likely minimal.
Research backing: Limited direct evidence for anxiety disorder, though traditional use is extensive. Amsterdam 2009 RCT used standardized extract, not tea.

Standardized extract capsules (clinical-grade, research-backed)

Standardization: 1.2% apigenin (same as Amsterdam RCT studies).
Typical dose: 220 mg per capsule (or 180-250 mg range depending on brand).
Dosing in studies: 1500 mg daily (roughly 6-8 capsules) for anxiety effect.
Pros: Consistent dose, matched to research evidence, more likely to produce measurable effect.
Cons: More expensive than tea, higher risk of side effects, larger pill burden, less pleasant than tea ritual.
Recommendation: If seeking clinical-level anxiolytic effect, standardized extract 1.2% apigenin is preferred over tea. Third-party tested (USP, NSF, ConsumerLab) for purity and potency.

Tinctures and liquid extracts

Potency: Variable, dependent on solvent and extraction method.
Dosing: Typically 1-2 ml (30-60 drops) per day.
Research backing: Limited; most RCTs use capsule extracts.
Note: Alcohol-content tinctures may interact with sedatives or medications.

Typical doses used in research

Research trials used the following doses for anxiety:

Amsterdam 2009 RCT: Standardized extract 220 mg per capsule, 1-5 capsules daily, maximum 1500 mg daily, for 8 weeks.
Mao 2016 RCT: 1500 mg daily standardized extract for 38 weeks.

These are research doses, not therapeutic recommendations for treating anxiety disorder. There is no proven "anxiety treatment dose" of chamomile established in clinical practice.

For self-use guidance:

Tea: 1-3 cups daily (50-150 mg flavonoids, variable apigenin).
Standardized extract: 500-1500 mg daily of 1.2% apigenin extract (start low, 300-500 mg, assess over 4 weeks).
Onset: Effect typically emerges over 2-8 weeks of consistent use, not acutely like benzodiazepines.

Safety profile and adverse effects

Chamomile has a long history of safe use, particularly as tea. However, several documented safety concerns exist.

Allergies and cross-reactivity (ragweed family)

Risk: Chamomile belongs to the Asteraceae family (also called Compositae), which includes ragweed, marigolds, and chrysanthemums. People with ragweed allergies have 1-3% risk of cross-reactivity to chamomile.
Symptoms: Oral itching, throat swelling, angioedema (rare but documented), anaphylaxis (very rare).
Who is at risk: Anyone with known ragweed or daisy family allergies.
Action: If you have ragweed allergies, avoid chamomile or use cautiously under medical supervision. Intradermal allergy testing may help clarify risk.
Source: EMA traditional herbal monograph, documented case reports in allergy literature.

Drug interactions (warfarin, anticoagulants)

Risk: Chamomile may potentiate warfarin (a blood thinner) and increase bleeding risk. Case reports document increased INR (International Normalized Ratio, a measure of blood clotting) and bleeding complications when chamomile tea was consumed alongside warfarin.
Mechanism: Possible CYP450 enzyme inhibition; coumarin compounds in chamomile may enhance warfarin effect.
Clinical consequence: Increased risk of bleeding, bruising, nose bleeds, GI bleeding, or serious hemorrhage.
Who is at risk: Anyone taking warfarin (Coumadin), other anticoagulants (apixaban, dabigatran), or antiplatelet drugs (aspirin, clopidogrel).
Action: If you take warfarin or anticoagulants, inform your doctor before using chamomile. Do not discontinue warfarin to use chamomile. INR monitoring before and after starting chamomile may be warranted.
Source: Multiple case reports in medical literature, EMA monograph, FDA herbal interactions database.

Sedative interactions

Risk: Chamomile is mildly sedating. Combined with benzodiazepines, sedating antidepressants, alcohol, or other CNS depressants, additive sedation may occur.
Symptoms: Excessive drowsiness, impaired cognition, slow reaction time.
Who is at risk: People taking benzodiazepines (alprazolam, diazepam), z-drugs (zolpidem), sedating antihistamines, or alcohol regularly.
Action: Inform your doctor if using chamomile alongside these medications. Monitor for excessive sedation. Do not drive or operate machinery if sedated.

Common side effects

Frequency: Mild, reported in 3-10% of users in clinical trials.
Most common: Drowsiness, nausea, headache, dizziness.
Onset: Usually within first 1-2 weeks.
Management: Take with food, start with lower doses (300-500 mg), increase gradually. Most resolve within 2-4 weeks of continued use.

Rare side effects and serious events

Allergic reactions: Rash, itching, anaphylaxis (very rare, case reports in literature).
Excessive sedation: Unusually high doses may cause marked drowsiness.
Gastrointestinal: Nausea, upset stomach, diarrhea.
Hepatotoxicity (liver injury): No documented cases in the literature for chamomile alone, unlike ashwagandha or CBD. Risk appears minimal.

Pregnancy and breastfeeding

Pregnancy: Safety data are insufficient. Traditional use includes chamomile tea for pregnancy-related symptoms in some cultures, but clinical evidence is lacking. Theoretical concern: high-dose extracts may have uterotonic effects (stimulate uterine contractions). Tea amounts are likely safe; supplement doses are not recommended without medical clearance.
Breastfeeding: Limited data. Chamomile components pass into breast milk in small amounts. Traditional use in some cultures includes chamomile for infant colic, but clinical studies are minimal. Consult your obstetrician or pediatrician before use.
Recommendation: Pregnant or breastfeeding women should consult their healthcare provider. Tea amounts are probably safe; medicinal extract doses should be avoided until more safety data exist.

Children and infants

Chamomile tea: Used traditionally for infant colic and fussiness in many cultures. Clinical evidence is limited.
Standardized extracts: Not studied in children. Safety unknown.
Recommendation: Chamomile tea in small amounts (weak brew, 1/4 cup) is culturally common and low-risk for infants, but medicinal doses and supplements are not recommended without pediatric medical guidance.

Who should NOT use chamomile

Do not use chamomile without medical clearance if you have:

Ragweed or Asteraceae family allergies: Risk of allergic reaction, cross-reactivity documented.
Taking warfarin or anticoagulants: Risk of increased bleeding.
Taking sedatives, benzodiazepines, alcohol regularly: Risk of additive sedation.
Pregnancy: Insufficient safety data on extract doses; tea probably safe.
Breastfeeding: Limited safety data; discuss with pediatrician.
Liver disease: Hepatotoxicity risk low but unknown with pre-existing liver disease.
Scheduled surgery: Stop 2 weeks before surgery (theoretical anticoagulant effect, sedation).
Children: Medicinal doses not studied; discuss with pediatrician.

How to use chamomile IF your doctor approves

Form selection: Tea is safest and most pleasant for daily use. Standardized extract 1.2% apigenin if seeking measurable anxiolytic effect.
Start low: Tea, 1-2 cups daily, OR standardized extract 300-500 mg daily.
Assess at 4 weeks: Track anxiety on a 1-10 scale daily. Is overall anxiety improving? Sleep better? Side effects tolerable?
Assess at 8 weeks: Most studies use 8 weeks. If no benefit by 8 weeks, chamomile may not work for you.
If continuing: Standard dose is 500-1500 mg daily of standardized extract, or 1-3 cups tea daily. No long-term safety data beyond 38 weeks. Consider cycling (e.g., 8 weeks on, 2 weeks off) for long-term use.
Stop if: Allergic reaction, increased bleeding (on warfarin), excessive sedation, worsening anxiety, or other adverse effects.

Chamomile tea vs extract capsules: Which should you use?

Use chamomile tea if:

You prefer ritual and taste.
You have mild, subclinical anxiety or everyday stress.
You want minimal side effects and maximum safety.
You cannot take capsules (swallowing difficulty, preference).
Effect is likely subtle; do not expect dramatic change.

Use standardized extract capsules if:

You want a research-level dose (1.2% apigenin, 1500 mg daily).
You seek measurable anxiety symptom reduction (like studies show).
You are willing to tolerate pill burden and higher cost.
You understand this is still modest effect, not equivalent to medication.

Neither if:

You have moderate to severe anxiety disorder requiring professional treatment (see clinical provider instead).
You have ragweed allergies (risk of reaction).
You take warfarin or anticoagulants without doctor approval.

Compared to clinical treatments

Chamomile is vastly different from evidence-based anxiety treatments:

Timing: SSRIs take 2-4 weeks to work. Chamomile takes 4-8 weeks.
Effect size: SSRIs reduce anxiety by 50-60% in clinical trials. Chamomile shows modest reductions, not comparable.
Proof level: SSRIs and CBT are high-grade evidence for anxiety disorders. Chamomile evidence is moderate, not high-grade.
Indication: SSRIs and CBT are proven for panic disorder, generalized anxiety disorder, social anxiety disorder, agoraphobia. Chamomile is studied only for "mild-to-moderate GAD," not clinical diagnosis.
Relapse: After stopping SSRIs, relapse risk is 30-50% without continued therapy. After stopping chamomile, relapse risk is 53% (Mao 2016), suggesting benefit is temporary and not curative.
Adjunct role: Chamomile may be useful for mild, subclinical stress or as an adjunct to therapy and lifestyle changes. It is NOT a first-line or standalone treatment for diagnosed anxiety disorder.

FAQ

Does chamomile tea really help with anxiety?

Chamomile has modest evidence in clinical trials (Amsterdam 2009, Mao 2016) for reducing mild-to-moderate generalized anxiety symptoms over 8 weeks. Effect sizes are small to moderate. Tea alone contains lower doses of apigenin than studied extracts (50-90 mg vs 1500 mg), so clinical effect on significant anxiety is likely minimal. For subclinical stress, everyday worry, or relaxation, chamomile tea is pleasant and safe. For diagnosed anxiety disorder, professional help (therapy, medication) is indicated.

How much chamomile should I take?

Tea: 1-3 cups daily (variable apigenin content, 50-150 mg estimated). Standardized extract (1.2% apigenin): 300-1500 mg daily, typically 500-1000 mg for anxiety effect. Start low (300-500 mg), increase over 2 weeks if tolerated, assess at 4-8 weeks. No proven anxiety treatment dose exists. Follow product labels and consult your doctor for personalized guidance.

Is chamomile safe?

Chamomile is generally safe for most adults without contraindications, especially tea. However, it is NOT safe if you have ragweed allergies (cross-reactivity risk), take warfarin (bleeding risk), are pregnant (insufficient safety data on extracts), or take sedatives (additive effects). Always consult your doctor before use, especially if you have allergies, take medications, or have health conditions.

Can I take chamomile with SSRIs?

Chamomile is mildly sedating. Combined with SSRIs (which can also cause drowsiness), additive sedation may occur. No major pharmacokinetic interaction is documented. Inform your doctor and psychiatrist of chamomile use. Do not stop SSRIs and switch to chamomile alone; SSRIs are proven treatments for anxiety disorder. Chamomile may be an adjunct to therapy and SSRI, not a replacement.

Does chamomile interact with warfarin?

Yes. Case reports document increased INR (blood thinning effect) and bleeding risk when chamomile is consumed with warfarin. Inform your doctor if using chamomile while on warfarin. Do not discontinue warfarin. INR monitoring may be recommended. If you take warfarin, discuss with your doctor before using chamomile.

Is chamomile safe in pregnancy?

Safety data are insufficient for chamomile extract supplemental doses in pregnancy. Traditional tea use is common in some cultures, and tea amounts are likely safe, but clinical evidence is lacking. High-dose extracts carry theoretical risk of uterine stimulation. Pregnant women should consult their obstetrician before using chamomile supplements. Tea in moderation is probably fine.

Chamomile vs valerian vs ashwagandha for anxiety: which is better?

All three have modest evidence for mild anxiety reduction, but differ in mechanism, evidence strength, and side effects.

Chamomile: 8-week RCTs show modest effect, apigenin-GABA mechanism, well-tolerated tea form, ragweed allergy and warfarin risks.
Valerian: Longer history of use, more sedating, less studied specifically for anxiety (more for sleep), hepatotoxicity risk (rare).
Ashwagandha: Stronger evidence base (more RCTs), adaptogenic mechanism, higher cost, documented thyroid and liver risks, pregnancy contraindication.

Bottom line: Chamomile tea is safest and most pleasant for mild stress. Valerian is more sedating (better for sleep-anxiety). Ashwagandha has more research but more safety concerns. None are treatment for clinical anxiety disorder.

Can chamomile make me sleepy?

Yes, chamomile is mildly sedating. This is why it is popular as an evening or bedtime tea. If you are sedation-sensitive, take chamomile in the evening only. Do not drive or operate machinery if drowsy. Combining with other sedating drugs (benzodiazepines, alcohol, some antidepressants) increases sedation risk.