7 Signs You May Have A Vitamin D Deficiency

With the Polar Vortex now firmly in our past, we're ready to shed some layers and soak up some springtime sun. About time, too, considering it's our greatest source of vitamin D, a nutrient crucial to bone, skin and mental health. In fact, about 80 to 90 percent of our vitamin D comes from sun exposure, says Dr. Michael F. Holick, M.D., Ph.D., a professor of medicine, physiology and biophysics at the Boston University Medical Center who has studied and published on vitamin D for decades. "The problem is [many of us] assume if you have a healthy diet that

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