I used Colloidal Silver in an eye that had pinkeye (conjunctivitis). That was the only time I've ever had pinkeye, and the only time I've ever used Colloidal Silver . I put in like 2 drops a.m. and p.m. I felt better pretty much immediately although it took several days for my eye to get better. I used the C.S. for about a week just to make sure things were good.