COMFREY LEAF (Symphytum officinale) Comfrey contains allantoin, which promotes the growth of connective tissue, bone, cartilage, and is easily absorbed through the skin. One of the most well-known healing plants, especially for its ability to heal tissue and bone (due to its allantoin content, which promotes the growth of connective tissue, bone, and cartilage, and is easily absorbed through the skin). Also used externally for varicose ulcers and veins and minor burns. A beneficial remedy for