Comfrey – Medicinal Plant for Pain and Injuries
Comfrey (Symphytum officinale) is a medicinal plant traditionally used for muscle pain, joint complaints, and bruises. Its roots and leaves contain the active compound allantoin.
Things worth knowing about "Comfrey"
Comfrey (Symphytum officinale) is a medicinal plant traditionally used for muscle pain, joint complaints, and bruises. Its roots and leaves contain the active compound allantoin.
What is Comfrey?
Comfrey (scientific name: Symphytum officinale) is a perennial medicinal plant belonging to the borage family (Boraginaceae). It grows preferably in moist environments such as riverbanks and meadows and is native to Europe and parts of Asia. In traditional medicine, comfrey has been used for centuries as a topical remedy for injuries, inflammation, and musculoskeletal pain.
Active Compounds and Constituents
The medicinally relevant compounds in comfrey are found primarily in the root, but also in the leaves:
- Allantoin: Promotes cell division and accelerates wound healing and tissue regeneration.
- Rosmarinic acid: A plant-derived compound with anti-inflammatory and antioxidant properties.
- Mucilaginous polysaccharides: Soothing agents that support tissue regeneration.
- Pyrrolizidine alkaloids (PAs): These compounds are hepatotoxic and potentially carcinogenic in high doses. Licensed preparations therefore contain only PA-reduced extracts.
Traditional Use
In folk medicine, comfrey has been used since the Middle Ages as a so-called bone-knitting herb. Its German name Beinwell is derived from an Old High German term meaning to join together, reflecting the traditional belief in its ability to heal bone fractures. Typical traditional uses include:
- Bruises and contusions
- Sprains and strains
- Muscle and joint pain
- Back pain
Scientific Evidence and Medical Use
Modern clinical studies confirm the anti-inflammatory and analgesic effects of comfrey extracts when applied topically. Significant pain relief has been demonstrated particularly for acute back and muscle complaints as well as ankle sprains. The European Medicines Agency (EMA) has recognised comfrey root extract as a traditional herbal medicinal product for external use.
Approved Indications (Topical Use)
- Blunt injuries such as bruises, sprains, and strains
- Muscle pain
- Back pain
Dosage Forms and Application
Comfrey is recommended for external use only. Available dosage forms include:
- Ointments and creams: Standardised finished products containing PA-reduced root extract
- Gels: Suitable for rapid absorption
- Compresses: Using fresh or dried leaves (folk medicine use)
The daily dose depends on the specific product. Application for more than 4 to 6 weeks per year should be avoided due to the pyrrolizidine alkaloid content. Application to open wounds or mucous membranes is contraindicated.
Safety and Side Effects
When used topically, comfrey is generally well tolerated. Occasional skin irritation or allergic reactions may occur. Important: Due to its pyrrolizidine alkaloid content, comfrey must not be taken internally. Internal use can cause severe liver damage and has shown carcinogenic effects in animal studies. Pregnant and breastfeeding women and children under 12 years of age should not use comfrey preparations.
Interactions
No clinically relevant interactions with other medications have been identified for topical use. However, concurrent application of other topical agents should be monitored for potential skin irritation.
References
- European Medicines Agency (EMA): Community herbal monograph on Symphytum officinale L., radix. EMA/HMPC/572844/2009.
- Predel HG et al. - Efficacy of a comfrey root extract ointment in comparison to a diclofenac gel in the treatment of ankle sprains. Phytomedicine, 2005; 12(10): 707-714.
- Bundesinstitut fuer Risikobewertung (BfR): Pyrrolizidine alkaloids in medicinal plants and herbal food supplements. BfR Opinion, 2013.
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