GNC WOMEN"s Ultra Mega now includes 1,600 IU of vitamin D-3. Emerging research suggests that adequate daily vitamin D intake may play a role in supporting breast and colon health. Supplies B-vitamins that are essential for energy production and metabolism. Each daily dose supplies an 50 mg B-vitamin complex including 400 mcg of folic acid that is essential for DNA formation. Includes 18 mg of iron, a vital nutrient that plays an essential role in forming healthy red blood cells and transporting oxygen.