Purest Colloids, Inc. hired one of the leading independent laboratories in the U.S. to do a toxicology study on our nanoparticle silver product, Mesosilver. The test, called an LD-50 test, was performed in accordance with the guidelines of the Federal Hazardous Substances Act (FHSA) Regulations, 16 CFR 1500. In the test work, the Mesosilver was given to a number of both male and female test animals. The amount of Mesosilver given to the animals was 5g/kg of 20 ppm nanoparticle or the equivalent of a 200-pound man taking 30 tablespoons at one time (the normal adult dosage is between one teaspoon and four tablespoons/day).

For more detailed information concerning silver toxicity, see the EPA Silver Toxicity Study.