Do you seem to catch a cold often? If so, you might want to consider taking vitamins and supplements to help prevent and treat colds and flus. There are a number of options available including natural vitamins and minerals, such as Vitamin C, Zinc, Echinacea, and others. Studies show that Echinacea can reduce length and severity of a cold by 10% to 30%, while vitamin C can reduce the duration of a cold by 24 to 36 hours. If you have any allergies, make sure to talk to your doctor first.