I had pnemonia all of august, sucked! I have barely been healthy a month and now have a nasty cold. But I always get sick when the season changes . My moms work developed cold-fx. the stuff does work. it doesnt cure anything rather it boosts your immune system and will make a cold or flu less harsh and make it go away quicker. If you are lucky enough and can tell you are about to get sick (slightly sore throat, tired etc) and take it it can prevent it from becoming a cold or flu. I have prevented it myself a few times with this stuff. Wasnt so lucky this time as I didnt have any around and by the tme I got to the store it was too late, I was sick. It is kinda expensive but you get what you pay for. I also find lots of garlic helps too.