Specific documentation on the optimum potency or dosage for effective use is sparse.  This has led to a wide range of products of varying potencies - all claiming to be the best.  According to N.R. Thompson of Runcorn Health Laboratory in England, the concentration of silver necessary to sterilize water contaminated with pathogenic bacteria is between 40-200 gamma, or .04 to .2 ppm (1 ppm = 1000 gamma).*  In 1940 and 1966, respectively, R.A. Kehoe and I.H. Tipton reported that under normal circumstances the average daily diet will yield approximately 50mcg to 100mcg of silver.  (Note: The reduction of silver in the average diet, due to commercial farming techniques, is similar to what has happened with other trace minerals including chromium, zinc and selenium - that are now known to be essential for good health.  This reduction may play a role in the worldwide epidemic of chronic infections.)

Therefore, it seems logical that a concentration of 3 to 5 ppm from your colloidal silver generator, yielding 15 mcg to 25 mcg of silver per teaspoon, will be a sufficient concentration to be both effective and safe to consume on a regular, daily basis.  An 8 oz. container of colloidal silver at a concentration of 3 ppm will contain approximately 355 mcg of total silver - well below any reported toxicity level of orally consumed silver - even if several ounces were consumed on a daily basis for several years.

With our 5 ppm colloidal silver, the yield is about 25 mcg per teaspoon, and we normally suggest anywhere from 1 teaspoon to 1 ounce (1oz. = 6tsp. = 150mcg) for daily consumption.

Any product containing higher concentrations, for example having higher levels than what could be found in the average daily diet, should definitely be taken with caution, only during a time of need and certainly not for extended periods.