Symphytum growing in the wild has a strong effect on the central nervous system and should be taken only in small amounts. There are about twenty varieties of comfrey, some of which are cultivated for fodder. One is Symphytum asperum or asperrimum, which is mainly grown in the Caucasus area, while Symphytum peregrinum is a Ukrainian variety. Symphytum orientate can be found in an area covering Armenia and running all the way to the north of Iran. These three varieties are valuable because of their leaves. While animals avoid the leaves of common comfrey, or Symphytum officinale, they enjoy these three kinds; pigs especially like them. The leaves of these three varieties of Symphytum, as well as of Siberian comfrey, are said to contain vitamin B12. The curative mucilage is present in the leaves, but in larger amounts in the roots. In the United States the leaves are even used in salads.
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