A public service of the

Silver Safety Council
Doctors, university professors, and world leaders in health-freedom advocacy

Guidelines for the safe use of silver supplements in human health

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Last updated:
January 2, 2022

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Makes Things Extremely Simple

The EPA RfD for silver is 5 micrograms of silver per kilogram of body weight per day (5mcg/kg/day). Most silver supplements, however, whether called ionic silver or colloidal silver, are labeled in terms of parts per million (“ppm”), which is a measure of the concentration of silver in the product, not by micrograms.

The Silver Safety Calculation is a simple tool that takes care of every one of the conversions for you. Just plug in the pounds that you weigh and the “ppm” of silver in whatever silver supplement you’re using, and it will take care of the rest. You don’t have to deal with mcg vs ppm, or with kg vs lbs, or to even subtract 75% of the RfD to get to the 25% limit. It does it all for you.


Note: For a detailed discussion of the math behind the Silver Safety Calculation (very detailed math intended only for scientifically minded people), click here.




The Silver Safety Calculation upon which the guidelines on this site are based was developed by the creator of Silver 100™ Ionic Silver Complex with Opti-Silver™.
Silver 100™ was designed for optimally efficient delivery of silver ions into the human body.
The suggested usage on the label for Silver 100™ fully complies with the Silver Safety Guideline.
You can learn much more about Silver 100™ with Opti-Silver™ at:
"To a chemist,
Opti-Silver represents
a brilliant chemical formulation..."

— Don Baird, PhD, chemistry professor, Nova Southeastern University; former director of the Department of Chemistry, Florida Atlantic University


* The EPA did not create and has not endorsed the Silver Safety Guideline or the Silver Safety Calculation. It has not represented that limiting
silver intake from silver supplements to 25% of the RfD will limit total silver intake to safe levels or adheres to the RfD guideline.