Q. I started taking 10,000 IU of Vitamin D a day. Six months later I suddenly developed severe constipation. Was the constipation caused by the large dose of vitamin D?
A. Vitamin D is a superstar among vitamins these days. It has become clear that low vitamin D levels are common and that the consequences can be serious. Too little vitamin D has been linked to a higher risk for conditions such as arthritis, cancer, osteoporosis, diabetes and even heart disease and stroke (American Journal of Epidemiology, Oct. 15, 2009).
It’s no wonder that many people have decided to take more vitamin D. Many experts agree that the RDA of 400 IU daily is too low. But excess vitamin D, a fat-soluble vitamin, can be toxic. Constipation is one possible symptom of too much vitamin D. Other side effects may include digestive upset and weakness.
We are sending you our new Guide to Vitamin D Deficiency with many more details on determining if you are deficient, getting adequate vitamin D and avoiding toxicity.
