When humans need more Vitamin B12—a nutrient that makes healthy red blood cells and turns food into energy—we can get it by ...

Learn how vitamin D benefits your body, and how to know if you're getting enough of this key nutrient or if you need more from sun exposure, your diet, or supplements.

Tuna is among the many types of fish that are hearty sources of vitamin D. In fact, a serving can provide over 5% of your ...