It’s not that colloidal silver is not effective and useful, it certainly is. However, commercial colloidal silver too expensive to use at effective dosage levels.
Laboratory research shows that to be effective, silver levels in the growth media must reach a minimum of 2 to 6 parts per million, depending on the pathogen being tested. In a human, that growth medium is primarily the blood supply. The average adult contains about 4 or 5 liters of blood. To reach that level, a person would need to consume a quart or liter of colloidal silver a day, for several days. At $50 to $100 per quart, that would make the cost very unaffordable for most people.
Case in point:
My doctors wife contracted MRSA in her knee following knee surgery. Her infectious disease doctor told her that she would have to have her leg amputated to stop the infection. Instead, my doctor treated her with colloidal silver, giving her 1 quart a day for 2 weeks. The silver was made according to the instructions at cgcsforum.org. At the end of 2 weeks, her MRSA was gone and she did not lose her leg.
Colloidal silver can only be sold in the USA as a mineral supplement. As such, the recommended dosages are in the order of 1 or 2 teaspoons a day. Its very hard to justify a quart a day as a mineral supplement. So the best way to use colloidal silver for acute illnesses is to make it yourself, for about the cost of the distilled water to make it. A quart of 20ppm colloidal silver contains only 20mg of silver, which costs just pennies.
Instructions for making quality colloidal silver, and the science behind it is documented at www.cgcsforum.com and www.cgcsforum.org