Achieving True Vitamin D Sufficiency Cuts Breast Cancer Risk In Half

It’s concerning enough that more than 40% of American adults1 meet the criteria for a clinical insufficiency in vitamin D (and a whopping 29%2 are straight-up deficient in the essential vitamin). But, disturbingly, a 2017 Breast Cancer review shows that up to 96%3 of people diagnosed with breast cancer are also deficient in vitamin D.