About this item Two additional mineral supplements found in the ultimate calcium mineral formula are magnesium and zinc Three forms of magnesium magnesium oxide, magnesium aspartate, magnesium chelate are included in the formula for improved absorption Zinc is an essential element necessary for sustaining all life, and acts as an activator of certain enzymes that are important in the transport of carbon dioxide in blood Country of origin is United States During the summer months products may arrive warm but Amazon stores and ships products in accordance with manufacturers' recommendations, when provided.