The Truth About Functional Beverages

The Truth About Glaceau Vitaminwater Defense Raspberry-Apple

50 calories
0 g fat
13 g sugars

Any boon this bottle provides to your immune system is coming from two primary ingredients: vitamin C and zinc. Vitamin C has a reputation for fighting the common cold, but studies don't fully support the claim. Zinc, on the other hand, might be a little more promising. A recent study found that daily zinc supplementation could increase the body's production of T cells, which help the body fight viral and bacterial infections. Problem is, the study used a daily dose of 15 milligrams—about four times as much as you get from a bottle of Defense.