Vitamin D

Here's where you'll find links to all the information you need about vitamin D, including how much sun you need to keep your vitamin D stores full; what kind of supplements to take and what dosages; how to test your vitamin D levels; who is at risk for vitamin D deficiency; and for the science geeks among us, a select list of the best studies on vitamin D.

New research on vitamin D, also called the sunshine vitamin, is showing that most Americans are deficient, and that a lack of it may be contributing to breast cancer, colon cancer, osteoporosis, heart disease, multiple sclerosis, fibromyalgia and other autoimmune diseases. In fact, if you work inside and use sunscreen you're probably vitamin D deficient. This applies even more if you live in a northern latitude.

You can get some vitamin D from food, and of course you can take supplements, but the very best, safest and most reliable source of vitamin D is sunshine. For those who just can't get enough sunshine, especially in the winter months, it's important to supplement.