Supplement analysis backed by scientific evidence · PT

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Limited evidenceJoints & skin

Arnica (Oral Homeopathic)

Oral homeopathic arnica pellets, taken for bruising and post-surgical swelling, have been tested repeatedly and the best-quality placebo-controlled trials are negative. Note the distinction: topical arnica gel is a real herbal preparation with some evidence, while the 30C pellets contain no arnica at all.

What the science says

  • Systematic reviews of placebo-controlled trials are negative Strong evidence

    A systematic review of 8 placebo-controlled trials of homeopathic arnica found the most rigorous studies showed no difference from placebo for post-traumatic or post-surgical outcomes; the review concluded the claim that arnica is efficacious beyond placebo is not supported. Trials in marathon runners, hand surgery, and dental extraction consistently failed to separate from placebo on pain, swelling, or analgesic use.

  • Later meta-analyses do not overturn this Limited evidence

    A 2021 meta-analysis of homeopathic arnica for postoperative recovery pooled placebo-controlled and active-comparator trials and reported a small effect on some outcomes, but it was dominated by heterogeneous, small, and lower-quality studies and included non-placebo comparisons. Effects in homeopathy meta-analyses characteristically shrink toward null as trial quality rises, and no adequately powered high-quality trial has shown a benefit.

  • Cosmetic-surgery trials are the most common positive claim and the weakest Limited evidence

    Reviews of arnica (often combined with bromelain) for post-procedure ecchymosis and oedema after rhinoplasty, facelift, and laser treatment find studies with small samples, inconsistent outcome measures, subjective photographic scoring, and frequent industry involvement. Results conflict, and the pooled picture does not establish a real reduction in bruising duration.

  • Topical arnica is a different product Moderate evidence

    Herbal topical arnica gel (typically 50 g tincture per 100 g, containing measurable sesquiterpene lactones such as helenalin) has trial evidence for hand osteoarthritis roughly comparable to topical ibuprofen, and mixed evidence for bruising. This is a pharmacologically active preparation. The oral 6C-30C pellets, by contrast, are diluted past Avogadro's limit and contain sucrose only — do not read topical results across to them.

Dosage & safety

Studied doseTypical homeopathic regimens are 5 pellets of Arnica montana 30C under the tongue 2-3 times daily starting before or immediately after injury or surgery; trials used 6C to 30C at similar frequencies. Since the pellets contain no measurable arnica, dose-response is not applicable. Topical herbal gel is applied 2-3 times daily to intact skin.
SafetyThe homeopathic pellets are inert sucrose and are physically safe, with trial adverse events matching placebo. Whole arnica is a different matter: the plant contains helenalin and is toxic if ingested in material amounts, causing gastroenteritis, mucosal irritation, tachycardia, and in large doses cardiac and hepatic damage — so never ingest herbal arnica tincture, mother tincture, or low potencies such as 1X-3X, and keep concentrated preparations away from children. Topical arnica can cause allergic contact dermatitis, especially in people sensitive to Asteraceae (ragweed, chrysanthemum, daisy), and must not be applied to broken skin or open wounds. Theoretical antiplatelet interaction warrants care around anticoagulants and surgery. Avoid in pregnancy and breastfeeding. The main practical risk of the oral pellets is skipping proven measures — ice, compression, elevation, and appropriate analgesia — or masking an injury that needs assessment.

Scientific references

Where to buy

Boiron, Arnica Montana, 30C, Approx. 80 Pellets

View on iHerb

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