• High in calcium, magnesium, vitamin C, zinc, manganese, copper and vitamin D. Forever Calcium contains a high source of the mineral but it’s also high in vitamin D and magnesium. Vitamin C 80 mg (100%), Vitamin D 5 µg (100%), Calcium 800 mg (100%), Magnesium 250 mg (67%), Zinc 6 mg (60%), Manganese 2 mg (100%), Copper 1 mg (100%).