vitamin D

The Surprising Reason You Are Sick, Tired, and Cranky

Vitamin D deficiency can lead to a host of worrisome ailments. Fortunately, getting all the D you need is easier -- and cheaper -- than most people think.

7 Nutrients You Need More Of

The latest Dietary Guidelines for Americans identified a handful of vitamins and minerals Americans weren't getting enough of. What are these seven nutrients, exactly?