Nutri-Essentials Calcium Magnesium Zinc + Vitamin D3, 300 Tablets. Each 3-tablet serving of Nutri Essentials Calcium Magnesium Zinc + Vitamin D3 contains: 25 mg of zinc 1000 mg of calcium and 400 mg of magnesium 600 IU of Vitamin D3 Our supplement makes it easy to incorporate these three essential minerals into your daily diet and eliminates the need for taking multiple supplements. Vitamin D3 is added to the supplement to help your body properly absorb and utilize the minerals. Calcium, zinc and magnesium play a vital role in bone health and nerve and muscle function.