Derma 3.6.9.™ Pro supports skin and coat health with a combination essential fatty acids, vitamins and amino acids. Biotin is necessary for cell growth, the production of fatty acids, and the metabolism of fats and amino acids. Zinc is an essential mineral for DNA duplication, cell division, and for the production of superoxide dismutase, a powerful skin antioxidant. These delicious duck-flavored chews are suitable for pets with sensitive diets.