Comfrey Leaf (Symphytum officinale) - External Use

Dried leaves of Symphytum officinale, Comfrey, the classic Western herbal preparation for external skin and topical applications. Comfrey has one of the longest-documented uses in Western herbalism - the common name "Knitbone" reflects the centuries-long traditional use for supporting healing of bruises, sprains, and minor wounds (used externally).

Important: External Use Only

Modern understanding has identified that Comfrey contains pyrrolizidine alkaloids (PAs) which can cause liver damage with internal consumption. The herb is no longer recommended for internal use by modern Western herbalism. Comfrey remains a valued external preparation for poultices, infused oils, and salves.

Key Facts

Botanical name

Symphytum officinale

Family

Boraginaceae

Common names

Comfrey, Knitbone, Bruisewort, Blackwort

Native region

Europe and parts of Asia

Active compounds

Allantoin (skin-supporting), mucilage, pyrrolizidine alkaloids (PAs - concern for internal use)

Use category

External topical only (poultices, infused oils, salves)

How to Use Comfrey Externally

Poultice: rehydrate dried leaves in hot water briefly, wrap in cloth, apply to affected area for 15-30 minutes. Infused oil: cover dried comfrey with olive oil, set in sunlight or warm spot for 4-6 weeks, strain. Use the oil directly or as the base for salves. Salve: combine comfrey-infused oil with beeswax (1 oz wax per 4-6 oz oil) and warm to combine; pour into containers.

Frequently Asked Questions

Why "external use only"?
Comfrey contains pyrrolizidine alkaloids which can cause liver damage with regular internal consumption. Modern Western herbalism reserves comfrey for external preparations.

Why is Comfrey called "Knitbone"?
The traditional Western reputation as a herb that supports the healing of bruises, sprains, and minor bone-and-tissue injuries.

What is allantoin?
A skin-supporting compound in Comfrey; also produced commercially for skin care products.

Should I apply comfrey to open wounds?
Generally apply to closed-skin injuries (bruises, sprains) rather than open wounds. The strong tissue effect could cause closing-over before deep healing.

Can I drink comfrey tea?
Modern Western herbalism does not recommend internal consumption of comfrey due to pyrrolizidine alkaloid content. Use externally only.

What about historical internal use?
Comfrey was historically used internally before modern understanding of PA toxicity. Modern recommendations have changed.

This product has not been approved by the Food and Drug Administration and is not intended to diagnose, treat, cure, or prevent any disease. We recommend that you consult with a qualified healthcare practitioner before using any herbal products, particularly if you are pregnant, nursing, or on any medications.