Plant Comparison
Arnica vs Willow Bark
A side-by-side comparison of two medicinal plants — every documented constituent, action, use, safety note and cited source, assembled automatically from the Omnia Sana database.
At a glance
Arnica and Willow Bark: they share 6 indicated uses (arthritis / joint pain, back pain, headache, …); 2 pharmacological actions in common.
Evidence face-off — shared uses
| Condition | Arnica | Willow Bark | Verdict |
|---|---|---|---|
| Arthritis / joint pain | 7/10 | 7/10 | Comparable evidence |
| Back pain | 7/10 | 9/10 | Stronger for Willow Bark |
| Headache | 7/10 | 1/10 | Stronger for Arnica |
| Inflammation (general) | 7/10 | 8/10 | Comparable evidence |
| Pain (general) | 7/10 | 9/10 | Stronger for Willow Bark |
| Skin irritation | 7/10 | 8/10 | Comparable evidence |
Evidence scores (1–10) are computed from the tier of each cited source. “Comparable” means the two scores are within one point. Follow a score to its detailed sources.
Key Constituents
The main anti-inflammatory principles; also responsible for the plant's toxicity and contact-allergy potential.
Aromatic and supporting constituents of the flower.
Present in small amounts; relevant to the caution against internal use.
Metabolised in the body to salicylic acid - the 'natural aspirin' that gives the analgesic, anti-inflammatory and antipyretic effects.
Pharmacological Actions
Topical anti-inflammatory for bruising, swelling and sprains
Helenalin, the sesquiterpene lactone of Arnica montana, shows anticancer activity against multiple tumour types in vitro and in vivo, largely by covalently inhibiting NF-kappaB p65 and inducing apoptosis (preclinical).
Analgesic and anti-inflammatory for low back pain (moderate evidence; dose-dependent, around 240 mg salicin/day) - in an RCT, 240 mg salicin/day left 39% pain-free vs 6% on placebo within 4 weeks
Analgesic and anti-inflammatory for low back pain (moderate evidence; dose-dependent, around 240 mg salicin/day) - in an RCT, 240 mg salicin/day left 39% pain-free vs 6% on placebo within 4 weeks
Antipyretic (reduces fever)
Traditional & Indicated Uses
inferred from anti-inflammatory action
Antiecchymotic / vulnerary (helps disperse bruises); Topical anti-inflammatory for bruising, swelling and sprains
Arnica montana and its constituent helenalin exert anticancer activity against several tumour types in vitro and in vivo, inhibiting NF-kappaB (p65) signalling, inducing apoptosis and synergizing with other anticancer agents (preclinical).
inferred from antimicrobial action
inferred from anti-inflammatory action
Topical analgesic for muscle soreness and pain
Topical analgesic for muscle soreness and pain
inferred from anti-inflammatory action
Topical anti-inflammatory for bruising, swelling and sprains
Relief of joint pain, osteoarthritis and rheumatic complaints
Analgesic and anti-inflammatory for low back pain (moderate evidence; dose-dependent, around 240 mg salicin/day) - in an RCT, 240 mg salicin/day left 39% pain-free vs 6% on placebo within 4 weeks
inferred from anti-inflammatory action
Analgesic and anti-inflammatory for low back pain (moderate evidence; dose-dependent, around 240 mg salicin/day) - in an RCT, 240 mg salicin/day left 39% pain-free vs 6% on placebo within 4 weeks; Relief of joint pain, osteoarthritis and rheumatic complaints
Safety, Cautions & Contraindications
EXTERNAL USE ONLY on unbroken skin. Arnica is toxic if swallowed and can cause stomach pain, vomiting, diarrhoea, breathing difficulty, irregular heartbeat and, in serious cases, cardiac arrest; the only safe oral form is the highly diluted homeopathic preparation.
Do not apply to broken or damaged skin, open wounds, eyes or mucous membranes.
As a member of the daisy family (Asteraceae) it can cause allergic contact dermatitis; prolonged topical use can also irritate the skin.
Because it works like aspirin, avoid willow bark if you are allergic to aspirin or salicylates, and do NOT give it to children or teenagers with a viral illness (risk of Reye's syndrome). Use caution in asthma (salicylate sensitivity).
Avoid with anticoagulant/antiplatelet medicines (bleeding risk) and in active peptic ulcer; avoid in pregnancy (especially the third trimester) and breastfeeding.
External Ids
Botanical Description
Aromatic mountain perennial herb with a basal rosette of oval, hairy leaves and one or two pairs of smaller opposite leaves on an erect, softly hairy flowering stem. Each stem bears one or a few large, bright golden-yellow, daisy-like flower heads with narrow, slightly twisted ray florets.[4]
Large deciduous tree (Salicaceae), 10-25 m tall (occasionally taller), fast-growing with a broad crown. Leaves are narrow and lance-shaped, silvery-white and silky-hairy beneath, giving the tree a shimmering appearance in the wind. Tiny flowers are borne in catkins appearing with the leaves in spring; the species is dioecious. The fruit is a small capsule releasing cottony-tufted seeds.[12]
Habitat
Grows in acidic, nutrient-poor mountain meadows, pastures and open woodland, typically at moderate to high elevations across central and northern Europe; increasingly scarce in the wild due to habitat loss and overharvesting.[4]
Native to Europe, western and central Asia and North Africa, growing on damp ground along riverbanks, floodplains and wet meadows; widely planted and naturalised elsewhere.[12]
Harvesting
The flower heads are picked by hand as they open, in mid- to late summer, and dried quickly in a warm, shaded, airy place; wild populations are protected in many regions, so cultivated or sustainably wildcrafted material is preferred.[4]
Bark is stripped from young branches (2-3-year-old growth is preferred, as salicin content is highest in younger bark) in spring, when the rising sap makes the bark peel most easily, then dried.[12]
Traditional Uses
Arnica flower has a long central European folk reputation, reflected in the name 'leopard's bane' and 'mountain tobacco', as a topical remedy for bruising, sprains, muscle soreness and swelling after minor injury, applied only to unbroken skin. Internal use of the whole herb has always been considered dangerous and is confined to highly diluted homeopathic preparations.[4]
Willow bark has one of the longest documented histories of any medicinal plant, used since antiquity (recorded by Hippocrates) as a remedy for pain and fever. Its salicin content, chemically related to aspirin, gives it official European herbal-monograph recognition for mild joint pain, headache and feverish colds, with modern clinical trials supporting benefit for low back pain.[11, 12]
Preparations
Standardised flower extract formulated into a cream, gel or ointment for external application to bruises, sprains and muscle soreness on unbroken skin.
Alcoholic tincture of the dried flower heads, diluted before topical application as a compress; never taken internally in this form.
Dosage
The EU herbal monograph gives cutaneous use only, in adolescents, adults and elderly - a semi-solid preparation containing 20-25% tincture applied as a thin layer 2-3 times daily, a 50% liquid-extract preparation 2-4 times daily, or 2.5 mL of a liquid preparation as an impregnated dressing 3-4 times daily. Apply to unbroken skin only. If symptoms persist after 3 to 4 days a healthcare practitioner should be consulted. Not recommended under 12 years. Never taken by mouth except as a highly diluted homeopathic preparation. Educational reference only, not a prescription.
Clinical trials for back pain have used around 240 mg salicin/day of standardised extract. Educational reference only, not a prescription; avoid if allergic to aspirin/salicylates, in children/teenagers with a viral illness (Reye's syndrome risk), or alongside anticoagulants.
References
Lookalikes Review
References & Sources
- Toma, C.C., Marrelli, M., Puticiu, M., Conforti, F. and Statti, G (2024) 'Effects of Arnica montana Phytotherapeutic and Homeopathic Formulations on Traumatic Injuries and Inflammatory Conditions: A Systematic Review', Plants (Basel), 13(21), pp. 3112. doi:10.3390/plants13213112 Meta-analysis / review
https://doi.org/10.3390/plants13213112 - Schmidt, T.J (2023) 'Arnica montana L.: Doesn't Origin Matter?', Plants (Basel), 12(20), pp. 3532. doi:10.3390/plants12203532 Traditional / reference
https://doi.org/10.3390/plants12203532 - Dragos, D., Gilca, M., Gaman, L., Vlad, A., Iosif, L. et al (2017) 'Phytomedicine in Joint Disorders', Nutrients, 9(1), pp. 70. doi:10.3390/nu9010070 Traditional / reference
https://doi.org/10.3390/nu9010070 - Kriplani, P., Guarve, K. and Baghael, U.S (2017) 'Arnica montana L. - a plant of healing: review', Journal of Pharmacy and Pharmacology, pp. 12724. doi:10.1111/jphp.12724 Traditional / reference
https://doi.org/10.1111/jphp.12724 - Iannitti, T., Morales-Medina, J.C., Bellavite, P., Rottigni, V. and Palmieri, B (2016) 'Effectiveness and safety of Arnica montana in post-surgical setting, pain and inflammation', American Journal of Therapeutics, 23(1), pp. e184-e197. doi:10.1097/MJT.0000000000000036 Meta-analysis / review
https://doi.org/10.1097/MJT.0000000000000036 - Verre, J., Boisson, M., Paumier, A., Tribolo, S. and Boujedaini, N (2023) 'Anti-inflammatory effects of Arnica montana (mother tincture and homeopathic dilutions) in various cell models', Journal of Ethnopharmacology, 318(Pt B), pp. 117064. doi:10.1016/j.jep.2023.117064 Preclinical
https://doi.org/10.1016/j.jep.2023.117064 - Rohrl, J., Pique-Borras, M., Jaklin, M., Werner, M., Werz, O., Josef, H., Holz, H., Ammendola, A. and Kunstle, G (2023) 'Anti-inflammatory activities of Arnica montana planta tota versus flower extracts: analytical, in vitro and in vivo mouse paw oedema model studies', Plants, 12(6), pp. 1348. doi:10.3390/plants12061348 Preclinical
https://doi.org/10.3390/plants12061348 - da Silva Prade, J., Balsamo, E.C., Machado, F.R., Poetini, M.R., Bortolotto, V.C., Araujo, S.M., Londero, L., Boeira, S.P., Sehn, C.P., de Gomes, M.G., Prigol, M. and Cattelan Souza, L (2020) 'Anti-inflammatory effect of Arnica montana in a UVB radiation-induced skin-burn model in mice', Cutaneous and Ocular Toxicology, 39(2), pp. 126-133. doi:10.1080/15569527.2020.1743998 Preclinical
https://doi.org/10.1080/15569527.2020.1743998 - Zacarias, C.A., de Mendonca Florenziano, R.F., de Andrade, T.A.M., de Aro, A.A., do Amaral, M.E.C., Dos Santos, G.M.T. and Esquisatto, M.A.M (2023) 'Arnica montana L. associated with microcurrent accelerates the dermis reorganisation of skin lesions', International Journal of Experimental Pathology, 104(2), pp. 81-95. doi:10.1111/iep.12469 Preclinical
https://doi.org/10.1111/iep.12469 - Chaiet, S.R. and Marcus, B.C (2016) 'Perioperative Arnica montana for reduction of ecchymosis in rhinoplasty surgery', Annals of Plastic Surgery, 76(5), pp. 477-482. doi:10.1097/SAP.0000000000000312 Randomized trial
https://doi.org/10.1097/SAP.0000000000000312 - Zitek, T., Postruznik, V., Knez, Z., Golle, A., Daris, B. and Knez Marevci, M (2022) 'Arnica montana L. supercritical extraction optimization for antibiotic and anticancer activity', Frontiers in Bioengineering and Biotechnology, 10, pp. 897185. doi:10.3389/fbioe.2022.897185 Preclinical
https://doi.org/10.3389/fbioe.2022.897185 - Sutovska, M., Capek, P., Kocmalova, M., Pawlaczyk, I., Zaczynska, E., Czarny, A., Uhliarikova, I., Gancarz, R. and Franova, S (2014) 'Characterization and pharmacodynamic properties of Arnica montana complex', International Journal of Biological Macromolecules, 69, pp. 214-221. doi:10.1016/j.ijbiomac.2014.05.051 Preclinical
https://doi.org/10.1016/j.ijbiomac.2014.05.051 - Merfort, I. and Wendisch, D (1987) 'Flavonoid glycosides from Arnica montana and Arnica chamissonis', Planta Medica, 53(5), pp. 434-437. doi:10.1055/s-2006-962766 Preclinical
https://doi.org/10.1055/s-2006-962766 - European Medicines Agency (HMPC) (2012) 'Community herbal monograph on Arnica montana L., flos'. Available at: https://www.ema.europa.eu/en/documents/herbal-monograph/final-community-herbal-monograph-arnica-montana-l-flos_en.pdf Traditional / reference
https://www.ema.europa.eu/en/documents/herbal-monograph/final-community-herbal-monograph-arnica-montana-l-flos_en.pdf - Gaertner, K., Baumgartner, S. and Walach, H (2021) 'Is Homeopathic Arnica Effective for Postoperative Recovery? A Meta-analysis of Placebo-Controlled and Active Comparator Trials', Frontiers in Surgery. doi:10.3389/fsurg.2021.680930 Meta-analysis / review
https://doi.org/10.3389/fsurg.2021.680930 - Kriplani, P. and Guarve, K (2020) 'Recent Patents on Anti-Cancer Potential of Helenalin', Recent Patents on Anti-Cancer Drug Discovery, 15(2), pp. 132-142. doi:10.2174/1574892815666200702142601 Preclinical
https://doi.org/10.2174/1574892815666200702142601 - Drogosz, J. and Janecka, A (2019) 'Helenalin - A Sesquiterpene Lactone with Multidirectional Activity', Current Drug Targets, 20(4), pp. 444-452. doi:10.2174/1389450119666181012125230 Preclinical
https://doi.org/10.2174/1389450119666181012125230 - National Capital Poison Center (Poison Control) (n.d.) 'Caution when using Arnica products'. Available at: https://www.poison.org/articles/caution-when-using-arnica-products-193 Traditional / reference
https://www.poison.org/articles/caution-when-using-arnica-products-193
- Shara, M. and Stohs, S.J (2015) 'Efficacy and Safety of White Willow Bark (Salix alba) Extracts', Phytotherapy Research, 29(8), pp. 1112-1116. doi:10.1002/ptr.5377 Meta-analysis / review
https://doi.org/10.1002/ptr.5377 - Maistro, E.L., Terrazzas, P.M., Perazzo, F.F., Gaivao, I.O.M. and others (2020) 'Salix alba (white willow) medicinal plant presents genotoxic effects in human cultured leukocytes', Journal of Toxicology and Environmental Health, Part A, 82(23-24), pp. 1223-1234. doi:10.1080/15287394.2019.1711476 Preclinical
https://doi.org/10.1080/15287394.2019.1711476 - Matyjaszczyk, E. and Schumann, R. (EU-FORA) (2018) 'Risk assessment of white willow (Salix alba) in food', EFSA Journal, 16(Suppl 1), pp. e16081. doi:10.2903/j.efsa.2018.e16081 Meta-analysis / review
https://doi.org/10.2903/j.efsa.2018.e16081 - Phillips, H.N., Sharpe, K.T., Endres, M.I. and Heins, B.J (2021) 'Effects of oral white willow bark (Salix alba) and intravenous flunixin meglumine on prostaglandin E2 in healthy dairy calves', JDS Communications, 3(1), pp. 49-54. doi:10.3168/jdsc.2021-0138 Preclinical
https://doi.org/10.3168/jdsc.2021-0138 - Kong, C.S., Kim, K.H., Choi, J.S., Kim, J.E. and others (2014) 'Salicin, an extract from white willow bark, inhibits angiogenesis by blocking the ROS-ERK pathways', Phytotherapy Research, 28(8), pp. 1246-1251. doi:10.1002/ptr.5126 Preclinical
https://doi.org/10.1002/ptr.5126 - Noleto-Dias, C., Ward, J.L., Bellisai, A., Lomax, C. and Beale, M.H (2018) 'Salicin-7-sulfate: A new salicinoid from willow and implications for herbal medicine', Fitoterapia, 127, pp. 166-172. doi:10.1016/j.fitote.2018.02.009 Preclinical
https://doi.org/10.1016/j.fitote.2018.02.009 - Wolfle, U., Haarhaus, B., Kersten, A., Fiebich, B. and others (2015) 'Salicin from Willow Bark can Modulate Neurite Outgrowth in Human Neuroblastoma SH-SY5Y Cells', Phytotherapy Research, 29(10), pp. 1494-1500. doi:10.1002/ptr.5400 Preclinical
https://doi.org/10.1002/ptr.5400 - Gagnier, J.J., van Tulder, M., Berman, B. and Bombardier, C (2006) 'Herbal medicine for low back pain (Cochrane review)', Cochrane Database of Systematic Reviews, (2), pp. CD004504. doi:10.1002/14651858.CD004504.pub3 Meta-analysis / review
https://doi.org/10.1002/14651858.CD004504.pub3 - Oltean, H., Robbins, C., van Tulder, M.W., Berman, B.M. and others (2014) 'Herbal medicine for low-back pain (Cochrane review update)', Cochrane Database of Systematic Reviews, 2014(12), pp. CD004504. doi:10.1002/14651858.CD004504.pub4 Meta-analysis / review
https://doi.org/10.1002/14651858.CD004504.pub4 - Amel Zabihi, N., Mahmoudabady, M., Soukhtanloo, M., Hayatdavoudi, P. and others (2018) 'Salix alba attenuated oxidative stress in the heart and kidney of hypercholesterolemic rabbits', Avicenna Journal of Phytomedicine, 8(1), pp. 63-72. Preclinical
https://scholar.google.com/scholar?q=Salix%20alba%20attenuated%20oxidative%20stress%20in%20the%20heart%20and%20kidney%20of%20hypercholesterolemic%20rabbits - Vlachojannis, J.E., Cameron, M. and Chrubasik, S (2009) 'A systematic review on the effectiveness of willow bark for musculoskeletal pain', Phytotherapy Research. doi:10.1002/ptr.2747 Meta-analysis / review
https://doi.org/10.1002/ptr.2747 - European Medicines Agency (HMPC) (n.d.) 'European Union herbal monograph on Salix [various species], cortex (Salicis cortex)'. Available at: https://www.ema.europa.eu/en/medicines/herbal/salicis-cortex Traditional / reference
https://www.ema.europa.eu/en/medicines/herbal/salicis-cortex - Chrubasik, S., Eisenberg, E., Balan, E., Weinberger, T., Luzzati, R. and Conradt, C (2000) 'Treatment of low back pain exacerbations with willow bark extract: a randomized double-blind study', The American Journal of Medicine, 109(1), pp. 9--14. doi:10.1016/S0002-9343(00)00442-3 Randomized trial
https://doi.org/10.1016/S0002-9343(00)00442-3
Generated automatically from the Omnia Sana plant database and its cited sources. For educational purposes only — not medical advice. Always consult a qualified practitioner before using medicinal plants.