Calcium and vitamin d are important at any age! They work together to help keep your bones healthy and strong. Your bones store most of the calcium in your body. However, to get the calcium from your diet into your bones, you need vitamin d. Calcium and vitamin d are also important for keeping your heart healthy, protecting your immune system, and maintaining nerve function. Vitamin d is know as the “sunshine vitamin,” because your body can make vitamin d when you skin is exposed to sunlight. However, since we’re often bundled up in cloudy San Francisco, many residents may not make enough vitamin d from the sun. Your doctor can tell you if you need to be getting more vitamin d.