clipped from: www.ponycity.com 
Nature's medicines are sprouting into the horse product market: healing salves, vitamin supplements, and even natural sedatives for an uptight horse. At first the natural wave consumed the human marketplace, but now horses can also enjoy a reunion with earth's precious products.
Comfrey is one of the newest selling herbal cosmetics for horses, and has been donned a miracle herb. But despite its revival, comfrey has been around the horse industry for centuries. Gypsies fed it to their horses to keep them fat and healthy. When a horse was sold to a farmer and dropped weight while fed alfalfa hay, the farmer would be furious thinking he was taken by the gypsy. The reason was comfrey, used as hay, has more protein then alfalfa. It is also the only land plant with vitamin B-12.
Comfrey is edible for people too. It can be eaten like cooked spinach, or raw in salads. Comfrey leaf and root tea is recommended for people with ulcers and broken bones.