Further, we do not produce colloidal silver. What we offer by donation towards our cause of feeding, clothing, housing, and educating people is sourced through a lab staffed by legit and certified scientists, researchers, doctors, and educators. We trust that they have the appropriate equipment to deem it 100 ppm, and that they have determined the appropriate dosages (for the quality that we offer, 1 drop is generally sufficient to ward off any sign of sickness, although an individual may self-medicate with 3 or 5 or even 10 or 20 drops depending on the severity of their condition with no ill effects, save the need to supplement with probiotics for higher doses).