What is the maximum allowable intake of Silver?

What does the Dutch government say about the maximum allowable intake of Silver? We repeatedly notice that the data on our site and packaging does not appeal to the imagination because there is no reference data. That is why two examples are detailed below. The criteria set by the government serve as a reference.
The first reference concerns the quality requirements of the Water Supply Decree Annex A. pertaining to Articles 4 to 4d.

Book of Prof. dr. Ronald J. Gibbs

Professor Ronald J. Gibbs was the director of the “Center for Colloidal Science at the University of Delaware” from 1981 to May 2000. He published more than 85 journal articles and five technical reports, edited fourteen books and held more than 60 presentations on national and international meetings. You can request the book in pdf format from us via e-mail.

Concentration and particle size

The silver concentration is unfortunately not so significant for the quality of colloidal silver. It is of course true that if you cannot expect silver to work, if there is no silver in it. But it is certainly not the case that it is an effective product if it contains a lot. We will try to explain to you why the silver content in itself is meaningless.

PPM Meter

The concentration of a colloidal metal or colloidal mineral in a liquid is indicated by ppm, which is equal to parts per million, which in turn is equal to the number of milligrams per liter (mg / l). The only good method to measure the concentration is through ICP (Inductive Coupled Plasma). You will find a good explanation of this measuring principle in the Report from Hogeschool Zuyd on colloidal gold.

What is protein silver?

Most products that claim to be highly concentrated colloidal silver (with a typical range of 30 ppm or higher) are in fact silver protein products. Some of these products are labeled as Silver Protein or Mild Silver Protein. But most are labeled as colloidal silver and the word protein does not appear anywhere on the label or product description.

Origin of Crystal

Crystal was founded in 1998 by Loek Stroeken. After many years of hard work and dedication to the Crystal vision and goals, he managed to offer people the very best quality colloidal mineral products.


Recently published article (2015) in Molecules ISSN 1420-3049 page 8856 -8874 where it is very clearly proven that colloidal silver with a diameter smaller than 30 nm works most effectively.