Plant Comparison
Arnica vs Wild Lettuce
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 Wild Lettuce: both belong to the Asteraceae family; they share 3 indicated uses (back pain, headache, pain (general)); 1 pharmacological action in common.
Evidence face-off — shared uses
| Condition | Arnica | Wild Lettuce | Verdict |
|---|---|---|---|
| Back pain | 7/10 | 2/10 | Stronger for Arnica |
| Headache | 7/10 | 2/10 | Stronger for Arnica |
| Pain (general) | 7/10 | 2/10 | Stronger for Arnica |
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.
Bitter, centrally-active constituents responsible for the sedative and pain-relieving effects; isolated lactucin and lactucopicrin produced analgesia comparable to ibuprofen and sedation in rodent tests.
The historical medicinal preparation, concentrating the active lactones.
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).
Mild analgesic / anodyne for pain (lactucin and lactucopicrin act on the central nervous system) - in mice these compounds produced analgesia comparable to ibuprofen
Calming for nervous tension and restlessness
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
Antitussive for an irritable, dry cough (traditional)
Sedative for sleeplessness / insomnia - lactucin and lactucopicrin showed sedative activity in animal models
Calming for nervous tension and restlessness
Mild analgesic / anodyne for pain (lactucin and lactucopicrin act on the central nervous system) - in mice these compounds produced analgesia comparable to ibuprofen
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.
Can be unsafe in large amounts or if harvested too early: overdose can cause sweating, fast heartbeat, dilated pupils, dizziness, ringing in the ears, vision changes, heavy sedation, breathing difficulty and, in extreme cases, death.
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]
Tall, bristly biennial herb with a milky latex throughout, and prickly-edged, often blue-green leaves that tend to twist to align edge-on with the sun ('compass plant' habit). Small, pale yellow, dandelion-like flower heads are borne in loose branched clusters atop a tall, spiny-stemmed flowering stalk.[11]
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]
Grows on dry waste ground, roadsides, hedgerows and disturbed soil; native to Europe, North Africa and Western Asia and naturalised in North America.
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]
The milky latex is traditionally collected by scoring the flowering stem and letting the exuded sap dry into lactucarium; the aerial parts (leaf and stem) are also cut and dried while the plant is flowering.[11]
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]
Wild lettuce has a long folk history, reflected in the name 'opium lettuce', as a mild sedative and analgesic remedy for insomnia, nervous tension and pain, and as an antitussive for irritable dry cough, its dried latex (lactucarium) once used as a milder, non-addictive alternative to opium.[11]
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.
Because of documented overdose toxicity (rapid heartbeat, heavy sedation, breathing difficulty), only conservative traditional herbal doses should be used and this herb should not be self-dosed at concentrated or extract strength without professional guidance. Educational reference only, not a prescription.
References
Lookalikes Review
Drug Class Interactions
Not documented
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
- Ullah, M.I., Anwar, R., Kamran, S., Gul, B. et al (2022) 'Evaluation of the Anxiolytic and Anti-Epileptogenic Potential of Lactuca serriola Seed Using Pentylenetetrazol-Induced Kindling in Mice and Metabolic Profiling of Its Bioactive Extract', Antioxidants (Basel), 11(11), pp. 2232. doi:10.3390/antiox11112232 Preclinical
https://doi.org/10.3390/antiox11112232 - Lee, M., Park, J., Cho, W., Jun, Y. et al (2024) 'Lactuca L. Extract Enhances Sleep Duration Through Upregulation of Adenosine A1 Receptor and GABA-A Receptor Subunits in Pentobarbital-Injected Mice', Journal of Medicinal Food, 27(7), pp. 661-668. doi:10.1089/jmf.2023.K.0250 Preclinical
https://doi.org/10.1089/jmf.2023.K.0250 - Paulsen, E. and Andersen, K.E (2015) 'Lettuce contact allergy', Contact Dermatitis, 74(2), pp. 67-75. doi:10.1111/cod.12458 Traditional / reference
https://doi.org/10.1111/cod.12458 - Wesolowska, A., Nikiforuk, A., Michalska, K., Kisiel, W. and Chojnacka-Wojcik, E (2006) 'Analgesic and sedative activities of lactucin and some lactucin-like guaianolides in mice', Journal of Ethnopharmacology, 107(2), pp. 254--258. doi:10.1016/j.jep.2006.03.003 Preclinical
https://doi.org/10.1016/j.jep.2006.03.003 - Gumprecht, T (1815) 'On the use of the Lactuca Virosa, in Hooping-Cough', Medico-Chirurgical Transactions, 6, pp. 608-617. doi:10.1177/095952871500600125 Traditional / reference
https://doi.org/10.1177/095952871500600125 - Trojanowska, A (2005) 'Lettuce, Lactuca sp., as a medicinal plant in Polish publications of the 19th century', Kwartalnik Historii Nauki i Techniki, 50(3-4), pp. 123-134. Traditional / reference
https://scholar.google.com/scholar?q=Lettuce%2C%20Lactuca%20sp.%2C%20as%20a%20medicinal%20plant%20in%20Polish%20publications%20of%20the%2019th%20century - Spadari, M., Pommier, P., Canioni, D., Arditti, J., David, J.M. and Valli, M (2003) 'Abuse of Lactuca virosa', Presse Medicale, 32(15), pp. 702-703. Preclinical
https://scholar.google.com/scholar?q=Abuse%20of%20Lactuca%20virosa - Lo Faro, A.F., Di Trana, A., La Maida, N., Tagliabracci, A., Giorgetti, R. and Busardo, F.P (2019) 'Biomedical analysis of New Psychoactive Substances (NPS) of natural origin', Journal of Pharmaceutical and Biomedical Analysis, 179, pp. 112945. doi:10.1016/j.jpba.2019.112945 Meta-analysis / review
https://doi.org/10.1016/j.jpba.2019.112945 - Besharat, S., Besharat, M. and Jabbari, A (2009) 'Wild lettuce (Lactuca virosa) toxicity', BMJ Case Reports, 2009, pp. bcr0620080134. doi:10.1136/bcr.06.2008.0134 Preclinical
https://doi.org/10.1136/bcr.06.2008.0134 - Stojakowska, A., Malarz, J. and Kisiel, W (1994) 'Sesquiterpene Lactones in Tissue Culture of Lactuca virosa', Planta Medica, 60(1), pp. 93-94. doi:10.1055/s-2006-959419 Preclinical
https://doi.org/10.1055/s-2006-959419 - Herbal Reality (n.d.) 'Wild Lettuce (Lactuca virosa): Benefits, Uses, Safety'. Available at: https://www.herbalreality.com/herb/wild-lettuce/ Traditional / reference
https://www.herbalreality.com/herb/wild-lettuce/ - RxList (n.d.) 'Wild Lettuce: Health Benefits, Side Effects, Uses, Dose & Precautions'. Available at: https://www.rxlist.com/supplements/wild_lettuce.htm Traditional / reference
https://www.rxlist.com/supplements/wild_lettuce.htm - Ghasemzadeh Rahbardar, M. and Hosseinzadeh, H (2024) 'Therapeutic potential of hypnotic herbal medicines: A comprehensive review', Phytotherapy Research, 38(6), pp. 3037-3059. doi:10.1002/ptr.8201 Meta-analysis / review
https://doi.org/10.1002/ptr.8201 - Block, K.I., Gyllenhaal, C. and Mead, M.N (2004) 'Safety and efficacy of herbal sedatives in cancer care', Integrative Cancer Therapies, 3(2), pp. 128-148. doi:10.1177/1534735404265003 Meta-analysis / review
https://doi.org/10.1177/1534735404265003
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.