Microphase is a vitamin and mineral supplement for horses of all ages. For Maintenance, Barren Mares, and horse in Light Training give 2Oz. For Yearlings, Pregnant Mares, Lactating Mares, horses in Moderate Training, and Stallions, give 3oz. For Foals,Weanlings, Intense Training, Lactating Mares (1St 3 Months, Last 3 Months), give 4Oz. Product is made with Dehydrated Alfalfa Meal, Wheat Middlings, Monosodium Phosphate, Calcium Carbonate, Yeast Culture, Zinc Sulfate, Zinc Proteinate, Ferrous Sulfate, Manganese Proteinate, Copper Sulfate, Copper Proteinate, Ethylenediamine Dihydriodide, Cobalt Sulfate.