It's common to hear about all the ways the sun is bad for us, but it's also important to remember that it's our leading provider of vitamin D. Although we can also get this very important vitamin through some fatty fishes and certain fortified foods, the sun is our primary source. Given the serious concerns about skin cancer, it's an excellent idea to make sure vitamin D makes it into your collection of supplements as well.
A vitamin D deficiency can lead to bone conditions such as osteomalacia and osteoporosis. A number of other studies indicate a possible link between vitamin D and a reduced risk of multiple sclerosis, cancer of various types and both Type 1 and Type 2 diabetes. Although the NIH says further research is needed to validate these links, there are plenty of reasons to make sure you get the recommended 200 to 400 IU (international units) per day.