Vitamin D is a fat soluble vitamin that helps a body absorb calcium, which is needed for building strong bones. It also helps muscles move, nerves carry messages from the brain to the body, and strengthens the immune system.
The best food sources of Vitamin D come from milk or other fortified “milk” drinks, such as soy, almond, oat, along with fatty fish, such as trout, salmon, tuna, mackerel. Beef liver, egg yolks, cheese and mushrooms also provide a little. A body can also make Vitamin D from the sun when bare skin is exposed, but factors such as clouds, smog, sunscreen, old age, and having dark-colored skin can reduce the amount it makes.