Being unable to make my own Colloidal Silver necessitates buying it already made and I prefer to buy it from a company that I trust. I would not hesitate to recommend Pro Colloidal Silver and buy the 25 ppm with the two for one offer, giving me a total of two litres which lasts me for a couple of months. I put a good slop in the dog's drinking water, my husband uses it as a mouthwash, I have gargled with it when I've had a sore throat and put it in my night time drinking water to be sipped at during the night when I feel a cold coming on. It was most helpful in helping me to recover from a nasty bout of viral Labrynthitis. It is also good for getting rid of the bugs inside thermos flask stoppers - the sort that come apart - as well as sterilising the inside of the flask as well. Being anti bacterial and anti viral it's uses are almost endless!