Each capsule contains 140 milligrams of calcium, 100 milligrams of pectin (from citrus fruits and apples) and 75 million live L. acidophilus cells. L. acidophilus, a probiotic, aids in maintaining a healthy balance of intestinal flora. Pectin is a prebiotic that gives the intestinal flora something to feed on. Bottle contains 100 capsules of friendly bacteria for the digestive system.