Iam not sure if you can get this product in the US..but here in Canada, we have an OTC cold medication called COLD FX..it contains ginseng which has been proven to be an immune booster.This product can greatly reduce the serverity of your symptoms as well as greatly reduce the time you are sick
In fact it was approved by Health Canada.I started to take Cold fx the day I felt the sniffles....and today,three days later iam fine...