For Optimal Health, Maintain a Vitamin D Level of 60 ng/mL
by Dr. Joseph Mercola STORY AT-A-GLANCE Vitamin D is involved in the biology of all the cells and tissues in your body, including your immune cells. Your cells need the active form of vitamin D to gain access to the genetic blueprints stored inside While the American Medical Association considers 20 nanograms per milliliter (ng/mL) […]