The oral reference dose for colloidal silver set by the Environmental Protection Agency is 5 micrograms of silver per kilogram of body weight daily, states the Silver Safety Council. The Silver Safety Calculation tool converts dosage amounts according to parts per million, body weight in pounds and dosage period length.
The Silver Safety Calculation tool is essentially an equation. It is the length of dosage time multiplied by body weight and then divided by parts per million, which yields the safe number of drops of colloidal silver per day. To determine safe amounts for ongoing daily ingestion, the first number in the equation should be 12. For ingestion over a short period of time, the first number in the equation should be 120. To determine safe dosage levels over a lifetime, the equation must start with 306,600.
A complete explanation of the Silver Safety Calculation tool is available at SilverSafety.com.