I guess all I can say is that in the 4+ years that I've been taking Colloidal Silver , my skin hasn't turned blue, I haven't had a cold or the flu....knock on wood, and since I've been spraying Colloidal Silver in my sinuses, I haven't had a need to take allergy medicines(prescription and OTC) that I use to live on for at least 3 or 4 months out of the year, as a matter of fact I've had to throw all of them out since they've all expired. They or anyone can say what they want, but I'll stick by my Colloidal Silver . Good luck.