prohormone. In the strict definition, a vitamin is something the body can't produce on it's own. So with all that said, what's the deal with "Vitamin D?" Like: how do we get it, how much do we need, can I supplement it, and is that safe? Where do we get it?
- Salmon, mackerel, tuna, sardines, cod liver oil
- Most of the milk supply in the United States
- Some breakfast cereals
- Some orange juices
- Milk substitutes (such as soy milk)
- Supplements
- Sun (UV rays)



