Safety:* Argentyn 23 is marketed as a dietary supplement under DSHEA. Federal agencies responsible for the protection of communities from harmful health effects related to exposure to natural and man-made hazardous substances, such as the Environmental Protection Agency (EPA) and the Agency for Toxic Substances and Drugs Registry (ATSDR) for example, have issued several risk assessments for Silver, and have established a Threshold of Toxicity Concern (TTC) of 350mcg/day for an average adult of 70Kg (for silver ingestion). Our suggested dosage of up to 3 tsp. a day as labeled, is based on these assessments; therefore, we can say that Argentyn 23 Bio-Active Silver Hydrosol is safe* when following these label directions, or use as directed by a healthcare professional. In addition to the above, a summary of peer-reviewed literature studies on ionic silver and colloidal silver (silver nanoparticles) is presented in the table below.[1-5] No observed adverse events are reported until 24,000X the EPA daily reference dose (RfD) of 5 micrograms of silver per kilogram of bodyweight. It is critical to note that all literature studies used high purity water, high purity silver materials, and endotoxin free materials. The purity of Argentyn 23 exceeds the standards used in these studies, thereby allowing interpretation of this literature with confidence. The presence of other ingredients in the formulations or other contaminants can dramatically impact the safety profile of other colloidal silver products.