Vitamin D is just as important as calcium for bone health. Without vitamin D, your body can't absorb calcium. Most adults need 600 IU daily. Those 71 and older need 800 IU per day. Vitamin D is in many foods and supplements, but there's another source: the sun.
Tip: You may have heard that your body produces vitamin D when exposed to sun. That's true, but even small amounts of sun can lead to skin damage. It's best to focus on food and use supplements if you don't get enough in your diet.