As the days get shorter and cloudier, people who struggle with issues like fatigue, sadness and depression during the winter ...

Historically, 400 IU (10 ug) of vitamin D was recommended for better health because it closely approximated the amount of vitamin D in a teaspoonful of cod liver oil. However, 800 to 1,000 IU is ...

Ekaterina Goncharova/Getty Images According to a new meta-study, an average supplemental dose of 3,320 IU of vitamin D per day is associated with reduced blood pressure, total cholesterol ...