A recent study, reported in the LA Times, found extra doses of Vitamin D do not prevent colds or other forms of upper respiratory infections. Controlled laboratory research, however, has shown that Vitamin D has beneficial effects on the immune system.
“Extra Vitamin D may not cure a cold if you already have good Vitamin D levels, but it does have a lot to do with how you feel.” Dr. Susan Sklar explains, “Vitamin D is, in fact, a hormone that your body needs to regulate over 400 different metabolic steps in the body. When you don’t have enough Vitamin D, you increase your risk of diabetes, breast cancer, colon cancer, ovarian cancer, heart attacks (in men), osteoporotic fractures, falls, depression and multiple sclerosis. It is estimated that breast cancer risk is decreased by 70% in those with optimized Vitamin D levels compared with those who have the lowest levels. Advancing age, excess body fat, and medications such as prednisone and anticonvulsants decrease Vitamin D levels.”