Not only can vitamin D protect your brain, it also protects your colon and your heart. This amazing nutrient hits colon cancer two ways. It switches on certain genes, and induces beneficial changes in the cellular skeleton. This slows cell division and helps the cells become normal colon cells rather than cancer.
As for your heart, researchers conducted a study on 18,225 health professionals over 10 years. Those with 25-hydroxy vitamin D deficiencies (less than 15 ng/mL) had double the risk of heart attack compared to those with concentrations of at least 30 ng/mL. Men with intermediate levels showed a 43-60% increased risk for heart attack compared to those with sufficient levels (at least 30 ng/mL).
You probably already know how great vitamin D is for your health. But the news continues to get better and better. And most everyone is deficient and needs to take a 5,000 IU supplement (such as the one sold by Advanced Bionutritionals) every day.
Ref: Journal of Cell Biology, November 17, 2008; 183(4):697-710; Arch Intern Med, 2008; 168(11).