I think this stuff is GREAT! One of my cats had a cut on his paw pad that got infected because I could smell it and he kept licking it and it wouldn't get better. I don't know how he got it because both cats are indoor only. I googled to try to find a solution and I ran across someone else having a similar problem and the person recommended Silver Biotics. Apparently this is good for people too if you are sick. Apparently Silver (no more than 10 ppm) is great for infection as silver is a natural anti-biotic. I got a bottle when I ordered my vitamins online and rubbed a little on his body so he would lick it off, the next day his foot completely didn't smell! I gave him a little once a day for a few days and his foot was completely better. I have taken some when I felt a cold coming on and never got a cold. So I think this stuff is good to keep in the cupboard. I got mine from iherb.com. You can read reviews of it on there if you want.