Kerabol Biotin from Equistro is rich in zinc, magnesium, selenium, methionine and D-biotin. These ingredients can contribute to your horse's healthy coat and hooves. For example, biotin is essential in various processes of growth, bone development and also supports an intact skin barrier. Methionine is an essential amino acid which can help improve keratin production. Zinc is needed to promote certain reactions in the body and thus contributes to good cell function.