Colloidal selenium and selenium food supplements are different product forms. “50 ppm” is a concentration statement. It does not identify the exact selenium form or an appropriate use. This guide explains the terminology and the information supplied for the technical Natur Total product.
What does colloidal selenium mean?
“Colloidal” describes particles finely distributed in another medium. Documentation for a product called colloidal selenium should explain its composition, possible dissolved fractions and particle characterisation. A name alone does not establish a particular size distribution.
See What are colloids? for the distinction between dispersions and solutions. Also check the intended use actually stated by the supplier.
How does it differ from a selenium supplement?
Selenium is an essential trace element. The NIH Office of Dietary Supplements lists selenomethionine, selenium-enriched yeast, sodium selenite and sodium selenate among common supplement forms. These are not synonymous with an unspecified particle dispersion.
Nutrient information cannot simply be transferred to a technical selenium product. The Natur Total product described here is explicitly not for ingestion. Questions about possible selenium deficiency should be discussed with a healthcare professional; this article provides no dosing advice.
What does 50 ppm mean?
PPM means parts per million. When it describes a mass fraction, 50 ppm equals 50 mg/kg. In a dilute aqueous liquid with density close to 1 kg/L, that is approximately 50 mg/L. The reference basis should be identifiable in the product or test documentation.
The value alone establishes neither particle size, chemical form, purity nor suitability for people. It is not an intake recommendation. The PPM explanation separates concentration from bottle volume; the units are independent of the substance being measured.
What does the Natur Total listing state?
| Feature | Listing information |
|---|---|
| Product | Natur Total Colloidal Selenium |
| Declared concentration | 50 ppm |
| Contents | 1000 ml |
| Packaging | Amber apothecary glass bottle |
| Stated purpose | Technical purposes and laboratory applications according to the current label |
| Restrictions | Not for ingestion; not for use as food, a food supplement, medicine or cosmetic |
The colloidal selenium 50 ppm product page provides the current description and price. This overview reproduces catalogue information, not an independent laboratory finding. Check the current label and documentation for the batch supplied.
Which questions should you ask?
- Does the expressly stated technical use match your project?
- Does the concentration refer to total selenium or another defined measurement?
- What information is available about composition and particles?
- Can you identify the batch, storage conditions and shelf-life information?
- Which test documents are available for the specific product?
The analysis certificate guide using silver as an example explains sample identification, method and result. Methods used for selenium must likewise suit the substance and analytical question.
Frequently asked questions
Is 50 ppm an intake recommendation?
No. A concentration is not a recommended intake. The technical selenium product in our range is not for ingestion.
Does amber glass establish a particular shelf life?
No. Packaging material alone does not define a storage period. Follow product-specific storage and shelf-life information.
Where can I find other technical colloids?
The other colloids collection lists the available products. Compare composition, concentration and stated use for each one.
Sources and scope
- NIH Office of Dietary Supplements: Selenium and common supplement forms
- NIST: Quantities, units and relative values
Editorial review: 12 November 2026. The nutrient reference does not establish suitability of the technical shop product for ingestion.