Perennial herb Symphytum officinale, in the family boraginaceae, used topically for wound healing. It contains allantoin, carotene, essential oils (oils, volatile); glycosides; mucilage, resin, saponins; tannins; triterpenoids, VITAMIN B12, and zinc. comfrey also contains pyrrolizidine alkaloids and is hepatotoxic if ingested.

Symptoms and diagnosis



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