Also known as Riboflavin.

What it's good for: Releases energy, keeps red blood cells healthy, makes hormones.

Where you get it: Dairy products, meats, poultry, whole and enriched grains, and green vegetables such as broccoli, turnip greens, asparagus, and spinach.

High doses of B-2 may help prevent migraine headaches.

RDA: Between 1.3 to 1.7 mg for adults.