Discovered this 20 years ago when my son woke up with pink eye on a Sunday morning. I went to the drugstore to see if there was anything I could get for him and was told he needed an antibiotic. Went to Sprouts, our natural food store, and was told to try this. I figured with pinkeye, he wasnt going to school anyway so what the heck! By bedtime, his eye looked great and in the morning he was stuck going to school! This worked the few times he had pinkeye and we avoided antibiotics which seem to be handed out like candy these days