Naturally full of nutrients like heart-healthy potassium, folate and vitamin C, calcium-fortified orange juice now is a contender for the calcium crown. With calcium-fortified orange juice offering as much calcium as milk, demand for this morning favorite is on the upswing. Sales in the calcium-fortified segment of the orange juice category are up 20% and growing. Clearly, this is a welcome new choice for the more than 80% of women who still aren't meeting their calcium requirement, according to the American Dietetic Association.