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Chamomile

Also sold as: German chamomile · Matricaria recutita · Matricaria chamomilla

A flowering herb used as tea or standardized extract for relaxation and sleep. Anxiety trials used a defined extract, which is not interchangeable with tea or isolated apigenin.

Anxiety Sleep

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NERD_PROTOCOL // EVIDENCE_MATRIXper goal

Research

SleepLimited · benefitAnxietyLimited · benefit
  • Sleep: Small, short trials suggest better subjective sleep quality; some insomnia measures were nonsignificant and postpartum benefits faded.
  • Anxiety: An 8-week trial in 57 adults with mild-to-moderate GAD found about a 3.1-point HAM-A advantage; independent replication is limited.

REALITY CHECK // Tea is not a dose-equivalent substitute for the standardized extract studied in GAD. Most anxiety data come from one research group, long-term relapse prevention was not statistically significant, and isolated apigenin has no established human sleep-trial equivalence.

Levels: how we grade evidence. Grey = evidence of no benefit; amber = evidence it makes this goal worse.

Ratings are self-reported by a self-selected group of users: how it felt, not proof that it works.

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Compare what your label says with what was used in trials. This is a trial range, not a personal prescription.

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How it was studied

01 // STUDIED_DOSE_RANGE
500-1500 mg/day extract
Reported GAD trial exposure, not a universal self-treatment dose; marker content 1.2% apigenin.
02 // TIMING_&_MATRIX
Preparation matters
Tea is variable; no validated tea-to-capsule conversion or mandatory clock-time is supplied.
03 // EVALUATION_WINDOW
2-8 weeks or longer
Sleep trials often lasted 2-4 weeks; acute GAD trial 8 weeks, with longer maintenance research.
04 // SAFETY_&_QUALITY_GATE
Allergy and medicines
Check Asteraceae allergy, anticoagulants, pregnancy and sedative combinations.

UPPER LIMIT // No numerical EFSA/NIH upper intake level is established in this dossier. Absence of a UL does not establish the safety of concentrated extracts or high-dose isolated apigenin.

NERD'S NOTENerd Protocols · a clinical and sports dietitian based in the EU

Summary

A standardized extract has a small anxiety signal. Long-term maintenance research did not significantly reduce relapse risk on its primary endpoint; this matters alongside symptom improvements. Sleep studies are heterogeneous and predominantly subjective.

Mechanism

Apigenin binding to GABA/benzodiazepine-related receptors is a laboratory and animal hypothesis, not evidence that chamomile acts like a benzodiazepine in humans. Tea, extract, essential oil and topical cream deliver different constituents.

Typical studied dose

The dossier reports 500-1500 mg/day standardized extract in GAD trials; a 500 mg capsule contained 1.2% apigenin. Sleep research spans tea and extracts over 2-4 weeks, without a common equivalent dose. Tea research in type 2 diabetes used three cups daily for 8 weeks.

Upper limit

No numerical EFSA/NIH upper intake level is established in this dossier. Absence of a UL does not establish the safety of concentrated extracts or high-dose isolated apigenin.

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Forms and label traps

Forms compared
Form on labelActive contentStudied range / dayAbsorption & GI toleranceVerdict
Dried flower tea
Best for: Tea-based studies and an evening ritual.
 Unstandardized: active content unknown no comparable trial range Variable apigenin glycosides; free apigenin is poorly soluble.
Usually mild on the stomach.		 Caution CHECK PREPARATION
No fixed active percentage or trial-equivalent extract mass is known.
Chamomile extract, 1.2% apigenin
Best for: Matching the GAD preparation.
 Extract weight · ~1.2% marker 500–1500 mg Repeatable composition used in the anxiety dossier.
Adverse events in trials were comparable to placebo.		 Studied standard SOURCE-SPECIFIC
Compare full extract mass; 1.2% is a marker, not an absorption multiplier.
Isolated apigenin
Best for: Recognizing a non-equivalent product.
 Unstandardized: active content unknown no comparable trial range A single isolated flavone is not a whole chamomile extract.
High-dose clinical tolerance is not established.		 Caution CHECK PREPARATION
Purity does not establish a human sleep dose; no conversion from chamomile trials.

Common label traps

  • TRAP_01 // Apigenin is stronger chamomile
    Isolated apigenin does not inherit the clinical outcomes of the full extract.
  • TRAP_02 // GABA binding proves a sedative drug effect
    Receptor findings are preclinical and do not establish equivalent clinical effects.
  • TRAP_03 // A sleepy blend guarantees the studied dose
    Undisclosed blend amounts prevent comparison with extract trials.

Other outcomes studied

Outside the five leaderboard goals. Same evidence levels as above.

  • oral_mucositis Limited · benefit
    Conflicting: the phase III 5-FU mouthwash RCT was negative; newer network meta-analysis and a prospective cohort suggest benefit. A methotrexate report was a case report, not an RCT.
    PMID 8630960 PMID 15693704 PMID 40611101 PMID 41334853
  • atopic_eczema_topical Limited · benefit
    A small cream trial reported marginal benefit against 0.25% hydrocortisone and placebo; this is topical, not oral evidence.
    PMID 10799352
  • glycemic_markers Limited · benefit
    Two small, single-region tea RCTs in type 2 diabetes reported lower HbA1c and improved antioxidant markers over 8 weeks; not a diabetes treatment.
    PMID 25194428 PMID 26437613
  • premenstrual_symptoms Limited · benefit
    Small trials and a review suggest symptom reduction; some preparations are mixtures, and this is not general GAD evidence.
    PMID 24439651 PMID 31970017
  • colic_and_dyspepsia No established evidence
    Standalone chamomile benefit is unestablished; mixed-herb findings do not isolate chamomile.

Reader questions

Does tea improve sleep?

Small trials suggest subjective improvement, but chronic-insomnia pilot measures were partly nonsignificant. In postpartum women, a 2-week effect was no longer evident at 4 weeks.

How much extract equals one cup?

No validated equivalence is supplied: plant batch, preparation and marker content differ.

Can it cause allergy or tolerance?

Severe allergy is documented, especially with related-plant sensitivity. Clinical receptor tolerance or dependence is not established; persistent symptoms need assessment.

Stack interactions

  • Caution Warfarin and other anticoagulants [CAUTION // CONTEXT]
    Potential bleeding concern; medication review is warranted, especially with concentrated products.
    PMID 32478963
  • Caution Sedatives, alcohol and sleep stacks [CAUTION // CONTEXT]
    Potential additive sedation is precautionary, not a quantified human interaction.
  • Caution CYP3A4 substrates / immunosuppressants [CAUTION // CONTEXT]
    In vitro inhibition warrants caution; no clinical magnitude can be inferred.
    PMID 16137701

Red flags: interactions and who should avoid it

Interactions

Warfarin: bleeding/INR concerns appear in case literature and interaction reviews. CYP inhibition is demonstrated in vitro, with uncertain clinical significance. Sedatives and alcohol may add sedation; glucose-lowering drugs warrant monitoring because small diabetes tea trials lowered glycemic measures.

Avoid or ask a doctor first if

Avoid with chamomile or Asteraceae allergy; severe cross-reactions including anaphylaxis are reported. Avoid high-dose extracts during pregnancy and unsupervised infant use. Stop for throat swelling, breathing difficulty or a significant allergic reaction; seek urgent care. Sedation may impair driving.

Sources (PubMed, 15)

  1. A randomized, double-blind, placebo-controlled trial of oral Matricaria recutita (chamomile) extract therapy for generalized anxiety disorder.
    PMID 19593179 · 2009 · Randomized placebo-controlled trial
    Small 8-week GAD trial with a modest symptom-score advantage.
  2. Long-term chamomile (Matricaria chamomilla L.) treatment for generalized anxiety disorder: A randomized clinical trial.
    PMID 27912875 · 2016 · Randomized maintenance trial
    Long-term symptom findings alongside nonsignificant relapse-prevention primary endpoint.
  3. Effects of chamomile (Matricaria chamomilla L.) on sleep: A systematic review and meta-analysis of clinical trials.
    PMID 39106912 · 2024 · Systematic review and meta-analysis
    Heterogeneous clinical sleep trials suggest subjective sleep-quality improvement.
  4. Effects of an intervention with drinking chamomile tea on sleep quality and depression in sleep disturbed postnatal women: a randomized controlled trial.
    PMID 26483209 · 2016 · Randomized controlled trial
    Short-term postpartum tea benefit that was not sustained at the later assessment.
  5. Prospective evaluation of a chamomile mouthwash for prevention of 5-FU-induced oral mucositis.
    PMID 8630960 · 1996 · Phase III randomized trial
    No mouthwash advantage for prevention of 5-FU oral mucositis.
  6. Wild chamomile (Matricaria recutita L.) mouthwashes in methotrexate-induced oral mucositis.
    PMID 15693704 · 2005 · Case report
    Methotrexate-associated mucositis report; lower-level evidence than an RCT.
  7. The effect of different mouthwashes to prevent oral mucositis in patients with radiotherapy and chemotherapy: a network meta-analysis.
    PMID 40611101 · 2025 · Network meta-analysis
    Comparative mouthwash evidence in oncology, with protocol-dependent findings.
  8. Chamomile mouthwash for prevention of chemotherapy-induced oral mucositis: A prospective cohort study in a pharmacist-led supportive care setting.
    PMID 41334853 · 2025 · Prospective cohort
    Nonrandomized supportive-care mouthwash findings.
  9. Proof of efficacy of Kamillosan(R) cream in atopic eczema.
    PMID 10799352 · 2000 · Clinical randomized trial
    Small topical atopic-eczema study, not oral chamomile efficacy.
  10. Effectiveness of chamomile tea on glycemic control and serum lipid profile in patients with type 2 diabetes.
    PMID 25194428 · 2015 · Randomized controlled trial
    Tea and glycemic/lipid markers in adults with type 2 diabetes.
  11. Chamomile tea improves glycemic indices and antioxidants status in patients with type 2 diabetes mellitus.
    PMID 26437613 · 2016 · Randomized controlled trial
    Tea and glycemic/antioxidant indices in adults with type 2 diabetes.
  12. Comparison of the effects of Matricaria chamomila (Chamomile) extract and mefenamic acid on the intensity of premenstrual syndrome.
    PMID 24439651 · 2014 · Randomized controlled trial
    Extract compared with mefenamic acid for premenstrual symptoms.
  13. Efficacy of Chamomile in the Treatment of Premenstrual Syndrome: A Systematic Review.
    PMID 31970017 · 2019 · Systematic review
    Small PMS evidence base.
  14. Warfarin and food, herbal or dietary supplement interactions: A systematic review.
    PMID 32478963 · 2021 · Systematic review
    Warfarin interactions with herbs and supplements.
  15. Inhibitory effects of the essential oil of chamomile (Matricaria recutita L.) and its major constituents on human cytochrome P450 enzymes.
    PMID 16137701 · 2006 · In vitro enzyme study
    Chamomile oil inhibition of CYP enzymes; does not quantify human drug interactions.

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