Zinc availability is often affected by high iron in the hay. Zinc helps to produce healthy bones, cartilage, and connective tissue, as well as helping to fight infection and reduce inflammation. It is important that copper and zinc ratios are balanced to each other, and to iron and/or manganese, whichever is higher. We follow Dr. Kellon’s recommendations of 4: 1: 3: 4 to 10: 1: 3: 3 (iron to copper to zinc to manganese) ratios. Bioplex Zinc 15% concentration (150mg/g) (to get 150mg of Zinc you need to feed 1 g of the powdered .