This stuff is awesome! If you take it early enough into a cold it will keep you from getting sick. Take it after you are already sick and reduce symptoms and duration. Never thought something like this would wok but it does. Just be sure to keep taking it for awhile after symptoms go away or they will come back.
I have used this product once when already in the midst of not feeling well and another at the first sign. Didn't catch the cold when everyone else around wad sick.