As I've written previously, vitamin D is essential for good health. Following is a great quote by Dr. Holick about the power of vitamin D and your health:
"If I had to give you a single secret ingredient that could apply to the prevention - and treatment, in many cases - of heart disease, common cancers, stroke, infectious diseases from influenza to tuberculosis, type 1 and 2 diabetes, dementia, depression, insomnia, muscle weakness, joint pain, fibromyalgia, osteoarthritis, rheumatoid arthritis, osteoporosis, psoriasis, multiple sclerosis, and hypertension, it would be this: vitamin D." - Dr. Michael F. Holick, Ph.D., M.D. from his book, The Vitamin D Solution
And the best part about vitamin D?
Just go outside and roam around or play for awhile, and you'll be getting all the vitamin D you need for the day.