Using colloidal silver was a recommendation from a friend, way back in 2008. Back then, I was living in Egypt, where the postal service, regarding packages and parcels, didn't seem to exist, due to too much corruption. Yes, you could order something from Amazon, but no, you would never receive it. Therefore, I was unable to purchase my own until I returned to the UK. At first, I tried colloidal silver from other companies but only found amber coloured. This I don't like, for various reasons, I prefer the clear. Not only does this company, Pro Colloidal Silver, make my preferred colloidal silver, they also make colloidal gold and colloidal copper, as well. I use gold for the osteoarthritis I have but recently purchased some for my father to try. My mother uses it, as well. I also use the copper for any external or internal infections as it's a perfect antibiotic. I don't seem to catch colds any longer I am pleased to say. In fact, I used to frequently suffer with impetigo on my face, which re-occurred a couple of times a year, but when I feel that oh so familiar tingling sensation coming on, I just quickly start spraying the colloidals on to the affected areas freqauently, which seems to kill the nasty bacteria before it gets a stranglehold on me, without the need to go to the doctors for creams and antibiotics, which takes two weeks to work. So I have never had a repeat of this terrible impetigo. I honestly don't think I could live without using the three of these colloidals. I absolutely love the stuff, I use silver for everything: eyes, ears, mouthwash spray, in water to purify it, drink it, spray it on human cuts, grazes, wounds, animal wounds, mix it with a cream to make it into an ointment, use it on door handles, keyboard, mouse, phones, you can also spray it on work surfaces where food is prepared, some people even use it in public toilets and/or hotel rooms. Heck! they even use it in space and now in plasters, I have noticed. This company ship incredibly fast too. In fact, the last time I ordered some on this one particular afternoon, the products arrived early the next morning. I couldn't believe it and I totally couldn't be happier. I am a 100% satisfied customer and highly recommend Pro Colloidal Silver and its other colloidals.