Plant Comparison
Peppermint vs Common Comfrey
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
Peppermint and Common Comfrey: they share 7 indicated uses (arthritis / joint pain, back pain, headache, …); 2 pharmacological actions in common.
Evidence face-off — shared uses
| Condition | Peppermint | Common Comfrey | Verdict |
|---|---|---|---|
| Arthritis / joint pain | 5/10 | 5/10 | Comparable evidence |
| Back pain | 5/10 | 5/10 | Comparable evidence |
| Headache | 8/10 | 5/10 | Stronger for Peppermint |
| Inflammation (general) | 5/10 | 5/10 | Comparable evidence |
| Pain (general) | 5/10 | 8/10 | Stronger for Common Comfrey |
| Skin irritation | 5/10 | 5/10 | Comparable evidence |
| Wounds | 5/10 | 5/10 | 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
Menthol is the dominant constituent of the leaf oil, responsible for the cooling sensation and much of the antispasmodic and analgesic activity.
Phenolic antioxidants of the leaf.
The key cell-proliferative constituent underlying comfrey's wound-healing reputation.
Contribute to the soothing, demulcent texture of the leaf and root.
Contribute to antioxidant and anti-inflammatory activity.
Hepatotoxic constituents naturally present in the whole plant; the reason internal use is not recommended and processed/detoxified extracts are used for research.
Pharmacological Actions
Traditional & Indicated Uses
inferred from anti-inflammatory action
inferred from antimicrobial action
inferred from anti-inflammatory action
inferred from antispasmodic action
inferred from antispasmodic action
inferred from anti-inflammatory action
inferred from anti-inflammatory action
inferred from anti-inflammatory action
inferred from anti-inflammatory action
inferred from anti-oedematous action
Safety, Cautions & Contraindications
Generally very safe. Essential oil should not be applied to the face or chest of infants or children — menthol can cause respiratory depression. Avoid enteric-coated capsules if taking antacids or acid-suppressing drugs. May worsen GERD by relaxing the lower oesophageal sphincter. Avoid in bile duct obstruction and gallstones.
Duke (2002) rates peppermint as +++ with clinical evidence (score 2) for antispasmodic activity, consistent with Commission E approval for IBS (irritable bowel syndrome) using enteric-coated peppermint oil capsules. Enteric-coated peppermint oil is one of the most clinically validated herbal treatments for IBS, reducing abdominal pain and spasm. Dose: 0.6 ml enteric-coated oil two to three times daily between meals (for IBS); 1.5–3 g dried leaf as tea three times daily for digestive complaints. Peppermint should not be applied near the face or nostrils of infants and small children (risk of laryngospasm from menthol). Contraindicated in cholelithiasis (gallstones) (Duke, 2002).
Big headline: Comfrey naturally contains pyrrolizidine alkaloids (PAs), which can seriously harm the liver if taken internally (Staiger, 2012; EMA, 2015). • Do not ingest comfrey (no teas, no internal tinctures, no capsules), because PA exposure from internal use is the main safety problem (Staiger, 2012; Bach et al., 1990). • Topical use only, short-term: EU herbal guidance describes comfrey root preparations for minor bruises and sprains in adults, and recommends limited duration (commonly up to about 10 days) (EMA, 2015; EMA/HMPC, 2024). • Do not apply to broken skin (open wounds, damaged/irritated skin) and avoid eyes/mucous membranes (EMA/HMPC, 2024). • Pregnancy & breastfeeding: best avoided (not enough safety margin for medicinal use) (EMA/HMPC, 2024). • Children/adolescents: not recommended for medicinal topical use in EU monograph context (EMA/HMPC, 2024). • If you have liver disease or take medicines that stress the liver, skip comfrey completely (risk management logic based on PA concern) (Staiger, 2012; EMA, 2015). • Skin reactions: mild rash/irritation can occur; stop if it irritates (Smith and Jacobson, 2011).
Duke (2002) classifies common comfrey (Symphytum officinale) with anti-inflammatory and wound-healing properties, supported by allantoin content (promotes cell proliferation). However, comfrey also contains hepatotoxic pyrrolizidine alkaloids. Internal use is no longer recommended, and Commission E approved only external use. Duke emphasizes that pyrrolizidine alkaloids are cumulative hepatotoxins associated with veno-occlusive disease, and prolonged or internal use is contraindicated (Duke, 2002).
External Ids
Botanical Description
Perennial herb, 30-90 cm tall, a sterile natural hybrid (Mentha aquatica x M. spicata) that spreads by rhizomes and surface stolons rather than viable seed. Stems are square, often purple-tinged. Leaves are opposite, lance-shaped to ovate with a sharply toothed margin, and release a strong menthol scent when crushed. Small, pale purple flowers are borne in dense, interrupted terminal spikes.[2]
Robust, hairy perennial herb (Boraginaceae), 60-120 cm tall, with a thick, black-skinned, mucilaginous taproot. Leaves are large, broad, lance-shaped and bristly-hairy, running down the stem as raised wings (decurrent) - the leaf base's smooth, untoothed margin is a key feature distinguishing it from toxic foxglove. Drooping clusters of tubular, bell-shaped flowers are cream, pink or purple depending on variety.[11]
Habitat
A cultivated hybrid grown worldwide as a crop and garden herb, propagated vegetatively since it rarely sets viable seed; naturalised in damp ground - streambanks, ditches and waste places - in temperate regions.[2]
Native to Europe and western Asia, growing in damp ground - riverbanks, ditches, damp meadows and waste ground - and widely cultivated.[11]
Harvesting
Aerial parts are cut at or just before full flowering (mid- to late summer), when the essential-oil (menthol) content peaks, then dried quickly out of direct sun, or distilled fresh for essential oil.[3]
Leaves are cut during the growing season (before flowering is often preferred for lower pyrrolizidine-alkaloid content); root is dug in autumn or spring from mature plants.[11]
Traditional Uses
Peppermint has one of the best-documented traditional uses of any herb - as a carminative and antispasmodic for indigestion, bloating and colic. Enteric-coated peppermint oil capsules are among the most clinically validated herbal treatments for irritable bowel syndrome, and topical or inhaled peppermint oil is traditionally and clinically used for tension-type headache and muscular aches.[1, 2, 4, 5]
Comfrey has one of the strongest traditional reputations of any European herb for wound healing and bone/tissue repair - the folk names 'knitbone' and 'boneset' reflect this - owing to its high allantoin content, which stimulates cell proliferation. Because the plant also contains hepatotoxic pyrrolizidine alkaloids, modern regulatory use is restricted to topical preparations only, for minor bruises and sprains, and internal use (teas, tinctures) is no longer recommended.[11]
Preparations
Dried leaf steeped in hot water, the classic digestive tea.
Standardised peppermint oil in enteric-coated capsules, the clinically studied form for irritable bowel syndrome, releasing the oil in the intestine rather than the stomach.
Diluted essential oil applied to the temples and neck for tension-type headache.
The officially recognised European herbal-monograph preparation, for minor bruises and sprains, short-term use only.
Dosage
Duke (2002) and Commission E guidance: about 0.6 mL enteric-coated oil two to three times daily between meals for IBS-type digestive complaints. Educational reference only, not a prescription.
EU herbal-monograph guidance describes comfrey root preparations applied topically for minor bruises and sprains in adults, for a limited duration (commonly up to about 10 days); do not apply to broken skin or near eyes/mucous membranes. Comfrey must never be taken internally (no teas, tinctures or capsules) because of its pyrrolizidine alkaloid content. Educational reference only, not a prescription.
References
Lookalikes Review
Dangerous Lookalikes
Not documented
References & Sources
- McKay, D.L. and Blumberg, J.B (2006) 'A review of the bioactivity and potential health benefits of peppermint tea (Mentha piperita L.)', Phytotherapy Research, 20(8), pp. 619-633. doi:10.1002/ptr.1936 Meta-analysis / review
https://doi.org/10.1002/ptr.1936 - Mahendran, G. and Rahman, L.U (2020) 'Ethnomedicinal, phytochemical and pharmacological updates on Peppermint (Mentha x piperita L.)-A review', Phytotherapy Research, 34(9), pp. 2088-2139. doi:10.1002/ptr.6664 Meta-analysis / review
https://doi.org/10.1002/ptr.6664 - Zhao, H., Ren, S., Yang, H., Tang, S. and others (2022) 'Peppermint essential oil: its phytochemistry, biological activity, pharmacological effect and application', Biomedicine & Pharmacotherapy, 154, pp. 113559. doi:10.1016/j.biopha.2022.113559 Meta-analysis / review
https://doi.org/10.1016/j.biopha.2022.113559 - Keifer, D., Ulbricht, C., Abrams, T.R., Basch, E. and others (2007) 'Peppermint (Mentha piperita): an evidence-based systematic review by the Natural Standard Research Collaboration', Journal of Herbal Pharmacotherapy, 7(2), pp. 91-143. doi:10.1300/j157v07n02_07 Meta-analysis / review
https://doi.org/10.1300/j157v07n02_07 - Gobel, H., Heinze, A., Heinze-Kuhn, K., Gobel, A. and Gobel, C (2016) 'Peppermint oil in the acute treatment of tension-type headache', Schmerz, 30(3), pp. 295-310. doi:10.1007/s00482-016-0109-6 Meta-analysis / review
https://doi.org/10.1007/s00482-016-0109-6 - Nair, B (2001) 'Final report on the safety assessment of Mentha Piperita (Peppermint) Oil, Mentha Piperita (Peppermint) Leaf Extract, Mentha Piperita (Peppermint) Leaf, and Mentha Piperita (Peppermint) Leaf Water', International Journal of Toxicology, 20(Suppl 3), pp. 61-73. doi:10.1080/10915810152902592 Meta-analysis / review
https://doi.org/10.1080/10915810152902592 - Kobayashi, T., Sugaya, K., Onose, J. and Abe, N (2019) 'Peppermint (Mentha piperita) extract effectively inhibits cytochrome P450 3A4 (CYP3A4) mRNA induction in rifampicin-treated HepG2 cells', Bioscience, Biotechnology, and Biochemistry, 83(7), pp. 1181-1192. doi:10.1080/09168451.2019.1608802 Preclinical
https://doi.org/10.1080/09168451.2019.1608802 - Romero, M.C., Navarro, M.C., Martin-Sanchez, J. and Valero, A (2014) 'Peppermint (Mentha piperita) and albendazole against anisakiasis in an animal model', Tropical Medicine & International Health, 19(12), pp. 1430-1436. doi:10.1111/tmi.12399 Preclinical
https://doi.org/10.1111/tmi.12399 - Riachi, L.G. and De Maria, C.A.B (2015) 'Peppermint antioxidants revisited', Food Chemistry, 176, pp. 72-81. doi:10.1016/j.foodchem.2014.12.028 Meta-analysis / review
https://doi.org/10.1016/j.foodchem.2014.12.028 - Herro, E. and Jacob, S.E (2010) 'Mentha piperita (peppermint)', Dermatitis, 21(6), pp. 327-329. doi:10.2310/6620.2011.10080 Preclinical
https://doi.org/10.2310/6620.2011.10080 - Sun, Z. and Wang, H. and Wang, J. and Zhou, L. and Yang, P (2014) 'Chemical Composition and Anti-Inflammatory, Cytotoxic and Antioxidant Activities of Essential Oil from Leaves of Mentha piperita Grown in China', PLoS ONE. doi:10.1371/journal.pone.0114767 Preclinical
https://doi.org/10.1371/journal.pone.0114767 - Farco, J.A. and Grundmann, O (2012) 'Menthol - Pharmacology of an Important Naturally Medicinal “Cool”', Mini-Reviews in Medicinal Chemistry. doi:10.2174/138955713804484686 Preclinical
https://doi.org/10.2174/138955713804484686 - Geuenich, S. and Goffinet, C. and Venzke, S. and Nolkemper, S. and Baumann, I. and Plinkert, P.K. and Reichling, J. and Keppler, O.T (2008) 'Aqueous extracts from peppermint, sage and lemon balm leaves display potent anti-HIV-1 activity by increasing the virion density', Retrovirology. doi:10.1186/1742-4690-5-27 Preclinical
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https://doi.org/10.1055/s-2006-951719 - Mahady, G.B. and Pendland, S.L. and Stoia, A. and Hamill, F.A. and Fabricant, D.G. and Dietz, B.M. and Chadwick, L.R (2005) 'In Vitro susceptibility ofHelicobacter pylori to botanical extracts used traditionally for the treatment of gastrointestinal disorders', Phytotherapy Research. doi:10.1002/ptr.1776 Preclinical
https://doi.org/10.1002/ptr.1776 - Tullio, V.C. and Roana, J. and Scalas, D. and Mandras, N (2019) 'Evaluation of the Antifungal Activity of Mentha x piperita (Lamiaceae) of Pancalieri (Turin, Italy) Essential Oil and Its Synergistic Interaction with Azoles', Molecules. doi:10.3390/molecules24173148 Preclinical
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https://doi.org/10.1055/s-0029-1186085 - Wu, Z. and Tan, B. and Liu, Y. and Dunn, J.L. and Guerola, P.M. and Tortajada, M. and Cao, Z. and Ji, P (2019) 'Chemical Composition and Antioxidant Properties of Essential Oils from Peppermint, Native Spearmint and Scotch Spearmint', Molecules. doi:10.3390/molecules24152825 Preclinical
https://doi.org/10.3390/molecules24152825 - Bojić, M. and Maleš, Ž. and Antolić, A. and Babić, I. and Tomičić, M (2019) 'Antithrombotic activity of flavonoids and polyphenols rich plant species', Acta Pharmaceutica. doi:10.2478/acph-2019-0050 Preclinical
https://doi.org/10.2478/acph-2019-0050 - Dorman, H.J.D. and Koşar, M. and Kahlos, K. and Holm, Y. and Hiltunen, R (2003) 'Antioxidant Properties and Composition of Aqueous Extracts from Mentha Species, Hybrids, Varieties, and Cultivars', Journal of Agricultural and Food Chemistry. doi:10.1021/jf034108k Preclinical
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https://doi.org/10.1016/j.sajb.2018.03.002 - Ayaz, M. and Sadiq, A. and Junaid, M. and Ullah, F. and Subhan, F. and Ahmed, J (2017) 'Neuroprotective and Anti-Aging Potentials of Essential Oils from Aromatic and Medicinal Plants', Frontiers in Aging Neuroscience. doi:10.3389/fnagi.2017.00168 Clinical study
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https://doi.org/10.1002/ptr.3037 - Orhan, İ.E. and Kartal, M. and Kan, Y. and Şener, B (2008) 'Activity of Essential Oils and Individual Components against Acetyland Butyrylcholinesterase', Zeitschrift für Naturforschung C. doi:10.1515/znc-2008-7-813 Preclinical
https://doi.org/10.1515/znc-2008-7-813 - Zeljkovıć, S.Ć. and Šišková, J. and Komzáková, K. and Diego, N.D. and Kaffková, K. and Tarkowski, P (2021) 'Phenolic Compounds and Biological Activity of Selected Mentha Species', Plants. doi:10.3390/plants10030550 Preclinical
https://doi.org/10.3390/plants10030550 - Desam, N.R. and Al-Rajab, A.J. and Sharma, M. and Mylabathula, M.M. and Gowkanapalli, R.R. and Albratty, M (2017) 'Chemical constituents, in vitro antibacterial and antifungal activity of Mentha×Piperita L. (peppermint) essential oils', Journal of King Saud University - Science. doi:10.1016/j.jksus.2017.07.013 Preclinical
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https://doi.org/10.1177/1934578x0900400419 - İşcan, G. and Kırımer, N. and Kürkçüoğlu, M. and Başer, H.C. and Demi̇rci̇, F (2002) 'Antimicrobial Screening of Mentha piperita Essential Oils', Journal of Agricultural and Food Chemistry. doi:10.1021/jf011476k Preclinical
https://doi.org/10.1021/jf011476k - Akdogan, M. et al (2004) 'Investigation of biochemical and histopathological effects of Mentha piperita labiatae and Mentha spicata labiatae on kidney tissue in rats', 23(7), pp. 321--327. Preclinical
https://scholar.google.com/scholar?q=Investigation%20of%20biochemical%20and%20histopathological%20effects%20of%20Mentha%20piperita%20labiatae%20and%20Mentha%20spicata%20labiatae%20on%20kidney%20tissue%20in%20rats - Grigoleit, H.G. and Grigoleit, P (2005) 'Peppermint oil in irritable bowel syndrome', 12(8), pp. 601--606. Randomized trial
https://scholar.google.com/scholar?q=Peppermint%20oil%20in%20irritable%20bowel%20syndrome - Mas-Coma, S (2004) 'Fasciolosis in humans'. Traditional / reference
https://scholar.google.com/scholar?q=Fasciolosis%20in%20humans - Duke, J.A (2002) 'Handbook of Medicinal Herbs, Second Edition'. Traditional / reference
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- Syarifah, A.N., Suryadi, H., Hayun, H., Simamora, A. and others (2023) 'Detoxification of comfrey (Symphytum officinale L.) extract using natural deep eutectic solvent (NADES) and evaluation of its anti-inflammatory, antioxidant, and hepatoprotective properties', Frontiers in Pharmacology, 14, pp. 1012716. doi:10.3389/fphar.2023.1012716 Preclinical
https://doi.org/10.3389/fphar.2023.1012716 - Melnyk, N., Popowski, D., Strawa, J.W., Przygodzinska, K. and others (2023) 'Skin microbiota metabolism of natural products from comfrey root (Symphytum officinale L.)', Journal of Ethnopharmacology, 318(Pt B), pp. 116968. doi:10.1016/j.jep.2023.116968 Preclinical
https://doi.org/10.1016/j.jep.2023.116968 - Trifan, A., Skalicka-Wozniak, K., Granica, S., Czerwinska, M.E. and others (2020) 'Symphytum officinale L.: Liquid-liquid chromatography isolation of caffeic acid oligomers and evaluation of their influence on pro-inflammatory cytokine release in LPS-stimulated neutrophils', Journal of Ethnopharmacology, 262, pp. 113169. doi:10.1016/j.jep.2020.113169 Preclinical
https://doi.org/10.1016/j.jep.2020.113169 - Brown, A.W., Stegelmeier, B.L., Colegate, S.M., Gardner, D.R. and others (2016) 'The comparative toxicity of a reduced, crude comfrey (Symphytum officinale) alkaloid extract and the pure, comfrey-derived pyrrolizidine alkaloids, lycopsamine and intermedine in chicks (Gallus gallus domesticus)', Journal of Applied Toxicology, 36(5), pp. 716-725. doi:10.1002/jat.3205 Preclinical
https://doi.org/10.1002/jat.3205 - Trifan, A., Wolfram, E., Esslinger, N., Grubelnik, A. and others (2021) 'Globoidnan A, rabdosiin and globoidnan B as new phenolic markers in European-sourced comfrey (Symphytum officinale L.) root samples', Phytochemical Analysis, 32(4), pp. 482-494. doi:10.1002/pca.2996 Preclinical
https://doi.org/10.1002/pca.2996 - Nastic, N., Borras-Linares, I., Lozano-Sanchez, J., Svarc-Gajic, J. and others (2020) 'Comparative Assessment of Phytochemical Profiles of Comfrey (Symphytum officinale L.) Root Extracts Obtained by Different Extraction Techniques', Molecules, 25(4), pp. 837. doi:10.3390/molecules25040837 Preclinical
https://doi.org/10.3390/molecules25040837 - Frost, R., MacPherson, H. and O'Meara, S (2013) 'A critical scoping review of external uses of comfrey (Symphytum spp.)', Complementary Therapies in Medicine, 21(6), pp. 724-745. doi:10.1016/j.ctim.2013.09.009 Meta-analysis / review
https://doi.org/10.1016/j.ctim.2013.09.009 - Trifan, A., Opitz, S.E.W., Josuran, R., Grubelnik, A. and others (2018) 'Is comfrey root more than toxic pyrrolizidine alkaloids? Salvianolic acids among antioxidant polyphenols in comfrey (Symphytum officinale L.) roots', Food and Chemical Toxicology, 112, pp. 178-187. doi:10.1016/j.fct.2017.12.051 Preclinical
https://doi.org/10.1016/j.fct.2017.12.051 - Dey, D., Jingar, P., Agrawal, S., Shrivastava, V. and others (2019) 'Symphytum officinale augments osteogenesis in human bone marrow-derived mesenchymal stem cells in vitro as they differentiate into osteoblasts', Journal of Ethnopharmacology, 248, pp. 112329. doi:10.1016/j.jep.2019.112329 Preclinical
https://doi.org/10.1016/j.jep.2019.112329 - Kuchta, K. and Schmidt, M (2020) 'Safety of medicinal comfrey cream preparations (Symphytum officinale s.l.): The pyrrolizidine alkaloid lycopsamine is poorly absorbed through human skin', Regulatory Toxicology and Pharmacology, 118, pp. 104784. doi:10.1016/j.yrtph.2020.104784 Preclinical
https://doi.org/10.1016/j.yrtph.2020.104784 - European Medicines Agency (2011) 'European Union herbal monograph on Symphytum officinale L., radix'. Traditional / reference
https://scholar.google.com/scholar?q=European%20Union%20herbal%20monograph%20on%20Symphytum%20officinale%20L.%2C%20radix - Royal Botanic Gardens, Kew (n.d.). Available at: https://powo.science.kew.org Traditional / reference
https://powo.science.kew.org - Staiger, C (2012) 'Comfrey: a clinical overview', 26(10), pp. 1441--1448. doi:10.1002/ptr.4612 Randomized trial
https://doi.org/10.1002/ptr.4612 - Duke, J.A (2002) 'Handbook of Medicinal Herbs, Second Edition'. Traditional / reference
https://scholar.google.com/scholar?q=Handbook%20of%20Medicinal%20Herbs%2C%20Second%20Edition - Vithayathil, M.K. and Edwards, M (2016) 'Comfrey herbal remedy causing second-degree heart block: do not be outfoxed by digitalis', BMJ Case Reports, 2016, pp. bcr2016216995. doi:10.1136/bcr-2016-216995 Clinical study
https://doi.org/10.1136/bcr-2016-216995 - Lin, C.C. and Yang, C.C. and Phua, D.H. and Deng, J.F. and Lu, L.H (2010) 'An outbreak of foxglove leaf poisoning', Journal of the Chinese Medical Association, 73(2), pp. 97-100. doi:10.1016/S1726-4901(10)70009-5 Clinical study
https://doi.org/10.1016/S1726-4901(10)70009-5 - Woodland Trust (2024) 'Foxglove (Digitalis purpurea)'. Available at: https://www.woodlandtrust.org.uk/trees-woods-and-wildlife/plants/wild-flowers/foxglove/ Traditional / reference
https://www.woodlandtrust.org.uk/trees-woods-and-wildlife/plants/wild-flowers/foxglove/
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.