I was listening to an interview with Dr. Robert Rowen and he was asked for a recommendation for a particular brand of colloidal silver. He said that a lot of people wanted to know about colloidal silver so he had a small study done to see what brand performed the best. He had 5 brands tested against MRSA (Methicillin-resistant Staph Aureus). All of them were big name brands. Surprisingly, 3 of them killed nothing! One of them was about 99% effective, but there was one brand that was about 99.999995 effective. You can read the transcript from the interview here.
Therefore, Dr. Rowen only trusts one brand – ACS 200. So that’s what I buy! I use it whenever one of us is sick. It took my daughter’s pink eye almost completely away in 1 day!