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Moderate evidenceJoints & skin

Boswellia Serrata

Boswellia resin extracts modestly reduce knee osteoarthritis pain and stiffness in placebo-controlled trials, usually within 4 weeks. The trials are small and mostly manufacturer-funded, so the size of the benefit is uncertain even though the direction is consistent.

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What the science says

  • Knee osteoarthritis pain Moderate evidence

    A 2024 meta-analysis of 13 RCTs (850 patients for WOMAC, 1185 for VAS) found no significant overall effect because of extreme heterogeneity (p = 0.087 for WOMAC, p = 0.40 for VAS), but the placebo-controlled subgroup analysis and meta-regression did favour Boswellia on WOMAC. An earlier 2020 meta-analysis of RCTs likewise reported lower pain scores versus placebo.

  • Stiffness and physical function Moderate evidence

    Pooled analyses report improvements in WOMAC stiffness and function subscales and the Lequesne index, with separation from placebo often appearing by day 5-30 in trials of AKBA-enriched extracts (100-250 mg/day). Effect sizes are small to moderate and confidence intervals are wide.

  • Asthma, ulcerative colitis and other inflammatory conditions Limited evidence

    These uses rest on a handful of small, mostly 1990s-2000s trials that have never been replicated with modern methodology. There is no reliable evidence Boswellia is useful for inflammatory bowel disease or asthma at present.

Dosage & safety

Studied doseAKBA-standardised extracts: 100-250 mg/day (e.g. 5-Loxin 100-250 mg, Aflapin 100 mg) taken once daily with food. Non-enriched extracts standardised to ~65% boswellic acids: 300-400 mg three times daily. Trials ran 4-12 weeks; absorption improves with a fat-containing meal.
SafetyGenerally well tolerated. The most common complaints are gastrointestinal: nausea, acid reflux, diarrhoea, and occasional skin rash. Boswellic acids inhibit several CYP450 enzymes and P-glycoprotein in vitro, so caution is warranted with narrow-therapeutic-index drugs (warfarin, ciclosporin, some statins). Traditionally regarded as an emmenagogue — avoid in pregnancy. Not prohibited in sport, but product quality varies widely and some cheap resins are adulterated.

How to take it

TimingOnce daily for AKBA-enriched extracts, three times daily for standard 65% boswellic acid extracts.
With food?With a fat-containing meal — absorption of boswellic acids rises severalfold with food.
Worth knowingCompare AKBA content rather than total extract weight; 100 mg of an AKBA-enriched extract can do more than 1,200 mg of a generic resin.

Interactions

With medications

  • warfarin, ciclosporin and other narrow-therapeutic-index drugs

    Boswellic acids inhibit several CYP450 enzymes and P-glycoprotein in laboratory work, which could raise drug levels. tell your prescriber before starting, and monitor as they advise

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does boswellia work for knee arthritis?

Boswellia has moderate evidence for modestly reducing knee osteoarthritis pain and stiffness, often within 4 weeks. The trials are small and mostly manufacturer-funded, and a 2024 meta-analysis found extreme heterogeneity, so the size of the benefit is uncertain.

What is the best boswellia dose?

AKBA-enriched boswellia extracts are taken at 100-250 mg once daily; standard extracts with about 65% boswellic acids at 300-400 mg three times daily. Take boswellia with a fat-containing meal, which improves absorption.

Does boswellia help ulcerative colitis or asthma?

There is no reliable evidence boswellia helps inflammatory bowel disease or asthma. These uses rest on a few small older trials never replicated with modern methods, so the evidence is limited.

Does boswellia interact with medications?

Boswellic acids inhibit several CYP450 enzymes and P-glycoprotein in lab work, so tell your prescriber before taking boswellia with warfarin, ciclosporin or some statins. Avoid boswellia in pregnancy.

Scientific references

Where to buy

Swanson Vitamins, Boswellia Serrata Extract, 125 mg, 60 Veggie Caps

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