While optimal Vitamin D levels are important, it is equally important that supplementation is monitored by your doctor. This article reviews some of the benefits (which we are hearing about a lot lately) as well as potential risks. PLEASE, be sure your doctor is monitoring your Vitamin D25OH levels if you are supplementing with Vitamin D. In addition, I recommend checking Vitamin D-1,25-dihydroxy levels if you’ve been supplementing to ensure that this form isn’t elevated. High levels of Vitamin D-1,25-dihydroxy can increase osteoclast activity and promote bone LOSS. Unfortunately, insurance coverage is often limited for Vitamin D25OH and even poorer for Vitamin D-1,25-diOH.