This vitamin helps your body use calcium for strong and healthy bones; on its own, it helps build strong muscles, helps decrease your chance of heart attack and may play a role in a strong immune system.
How much you need: Ages 18-50: 5 micrograms (mcg)/day; ages 51-70: 10 mcg/day; ages 71+: 15 mcg/day
Where to get it: Fortified milk, fatty fish (salmon, tuna). Also formed naturally as a result of exposure to sunlight.