Niki Bezzant investigates. It's such an oft-repeated thing it has become common knowledge: Vitamin C is what we need when we are coming down with a cold or flu. Many swear it helps them prevent winter ...

While there’s not irrefutable evidence that any specific vitamins or minerals will prevent illness, zinc may help ease an oncoming cold. Clement S. Rose, MD, an internal medicine specialist at ...

Here’s how to treat cold sores, and whether you can prevent them. The herpes virus is “very contagious,” said Dr. Dean Blumberg, chief of pediatric infectious diseases at UC Davis Health.