What are the dosage recommendations for colloidal silver?

Doses of colloidal silver vary significantly depending on various criteria. It is possible that you could take up to 10 times the “nutritional” dose during an illness. This would still be less than the maximum dosage recommended by the EPA (US Environmental Protection Agency).*1


According to scientific studies and available literature*2 there are three main cases which significantly influence the dosage: the nutritional dose, the short term dose for a temporary illness and the long term dose for a chronic illness. The authors Jeanne Perros and Max Crarer recommend leaving colloidal silver under the tongue for one minute before swallowing for better absorption.


Again, the ingestion of colloidal silver in the EU has been prohibited since January 1st 2010 - unlike products such as Oligostim and Oligosol (containing silver), which have had market authorisation to be marketed as medicinal products.


Institut Katharos does not recommend ingesting colloidal silver, even though there are no side effects. This page is only for information purposes and based on best practice abroad.

Nutritional dose


It's been estimated that Americans consumed the equivalent of 50 to 100 micrograms of silver at the beginning of the 20th century. Due to intensive farming and the use of pesticides, synthetic fertilizers, fungicides and insecticides, soils have become depleted. To the extent that today a Western person ingests on average only 7 micrograms per day, according to the WHO. That is 7 to 15 times less than 100 years ago.*3

Following the analysis of hair minerals, Dr. Becker made a direct link between being ill and having a silver deficiency. He found that people with a silver deficiency were ill more often and that their illnesses lasted longer.*4

To return to the levels at the start of the 1990s, you would need to consume 43 to 93 micrograms of silver per day. For a concentrated solution containing 40 ppm this would be equivalent to ¼ to ½ a teaspoon (1.25 to 2.5 ml) per day.



Temporary illnesses


The term "temporary illness" refers to a temporary state of illness lasting for several days (e.g. flu) to several weeks (e.g. burns). 

In many tests numerous viruses and bacteria were killed in a very short period of time. In fact, an article from the respected magazine “Science Digest” emphasized the rapid speed at which bacteria and viruses have been killed in vitro. In less than 6 minutes almost all of the 650 viruses and bacteria were killed.*5

To stop the development of the disease and eradicate the pathogens, a higher concentration of colloidal silver is needed. For a concentrated solution at 40 PPM you would have to take the equivalent of 1.25 to 2.5 teaspoons (6 to 12 ml) per day for a short period of time. 


Chronic illnesses


The term "chronic illness" refers to a state of illness that lasts for several months to several years.

One of the chronic diseases, for which colloidal silver has consistently been effective, is Lyme disease*6. Dr. Paul Farber described the effects of silver proteins on Lyme disease in his book “The Micro-Silver Bullet”.


According to the EPA we can ingest up to 5 micrograms of silver per kg of body weight per day for life without any side effects*7. If you weigh 75 kg, you can take the equivalent of 375 micrograms. This would be the equivalent of up to 2 teaspoons (10 ml) per day for a 40 PPM solution for a person weighing 75 kg.

It should also be noted that Dr. Altman ingested 6 times the maximum dose recommended by the EPA for 6 months*8 without noting any side effects. He also remarked that the vast majority of the silver had been excreted by the body after 48 hours.



1) Report on the recommended maximum dose for ingestion by the EPA (American Environmental Protection Agency): 


2) “L’argent colloïdal, un remède en or” (en. Colloidal silver, a cure worth its weight in gold) by Jeanne Perros, edition Guy Trédaniel, 2011, p.19-83

3) Ibid, p. 75

4) Ibid, p. 76

5) Article by Jim Powell, Science Digest, 1971: “Our Mightiest Germ Fighter”: http://media.wix.com/ugd/dffe9d_a1730cbde4094215b0a182b940a25439.pdf


6) "The Micro Silver Bullet" by Dr. Farber: http://www.thesilveredge.com/farber.shtml#.VMvql2RwvUc


7) EPA Report (CASRN 7440-22-4): https://web.archive.org/web/20150206003217/http://www.epa.gov/iris/subst/0099.htm

8) Study by Dr. Altman on the capacity of excreting colloidal silver: “Colloidal Silver: Where does it go when you drink it? How long does it stay there?”



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