Low moisture part skim mozzarella cheese with added vitamin A, vitamin D and calcium. Individually wrapped snacks. More of what's in milk! Excellent source of vitamins A & D. 20% more vitamin D & 16% more vitamin A compared to our regular low moisture part skim mozzarella string cheese. Excellent source of calcium. Super nutrition including extra amounts of vitamin A: 20% of the RDA, promotes normal vision and bone growth; vitamin D: 20% of the RDA, which promotes calcium absorption & helps support healthy bones and teeth; calcium: 25% of the RDA, which helps support strong and healthy bones and teeth. Cheese Heads Superstring has 1000 (IU) vitamin A per serving compared with 175 (IU) in regular string cheese, has 80 (IU) of vitamin D per serving compared with 0 (IU) in regular string cheese.