GNC WOMEN's Ultra Mega ACTIVE is the premium multivitamin for women who workout regularly. It now includes 1,600 IU of vitamin D-3. Emerging research suggests that adequate daily vitamin D-3 intake may play a role in supporting breast, colon and immune health. It provides 500 mg of bone-strengthening calcium. Adequate calcium and vitamin D-3 in a healthy diet throughout life may reduce the risk of osteoporosis. It also features key electrolytes including potassium and chloride, which help to regulate body fluids. Includes 18 mg of iron, a vital nutrient that plays an essential role in forming healthy red blood cells a transporting oxygen.