Add Yahoo as a preferred source to see more of our stories on Google. Senior editor Alex Beggs OD-ed on Vitamin C for the sake of science. There's so much promise in a packet of Emergen-C, the Crystal ...

Emergen-C may help boost the immune system. However, evidence is lacking on whether it can treat and prevent colds. Emergen-C may be worth taking as a general immune booster, but the jury is still out ...