Institut Katharos, Colloidal Silver 40 PPM Spray, 100 ml

300 Spray Servings (Free eBook provided)

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  • RRP: £23.99
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Premium colloidal silver with antiseptic properties for skin problems and infections. Specialised in Ionic-Colloidal Silver, the French company Institut Katharos has developed a unique solution, certified by 3 independent laboratories, and characterised by its higher purity, maximum concentration and optimal dosage. Made up of 96% ionic silver (dissolved in water) and 4% colloidal silver (suspended particles in water), concentrated at 40 ppm, and water of extreme purity, which gives it unprecedented quality. More effective, natural and safe, it can be used daily for the whole family and pets. Colloidal silver kills bacteria, viruses and other microbes. For additional information, a free eBook is also provided: Discover the secrets of this incredible product! 

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How does Colloidal Silver work?

Colloidal Silver kills bacteria, viruses and other microbes in at least three ways, all leading to deactivation of the DNA and bacterial proteins without causing tissue damage:

  1. DNA Binding: Inhibiting bacterial reproduction by association with their DNA. Colloidal silver goes straight to the DNA of the virus (and other pathogens) and binds with the DNA. In the process, it destroys the hydrogen that holds the cell together, destroys the cell and kills the virus.
  2. Pathogen Cell Membranes: Disruption of the outer membrane proteins of pathogens. Colloidal silver also attaches to the virus’ cell membrane and foils its attempt to attach itself to the host cells, preventing infection.
  3. Catalytic Oxidation: Deactivation of bacterial enzymes. Colloidal silver attaches to oxygen molecules and reacts with certain molecules that circle around viruses. The virus then fails to attack body cells.

Silver is recognised for its powerful antimicrobial properties. It's also known for its antiseptic properties for skin problems.

Historically, silver has been utilised for the preservation of food and drink, as well as to accelerate healing. In recent times, improved manufacturing processes have made it possible to obtain an active concentrated Colloidal Silver solution with optimised efficiency.

Nowadays, people around the world testify to the benefits of Colloidal Silver and use it for many infections. 

For more information, do not hesitate to read these books which identify diseases, infections and their remissions following the testimony of many users of Colloidal Silver who have found a beneficial effect in its use:

  • "Everything you need to know about Colloidal Silver", by Max Crarer (Zealand publishing house, 2013), page 39-41
  • "L'Argent Colloïdal, un remède en Or", by Jeanne Perros (éditions Guy Trédaniel, 2011), page 140-142
  • "The Ultimate Colloidal Silver Manual", by Steve Barwick


Why is Institut Katharos Ionic Colloidal Silver better than other solutions?

More Concentrated for Increased Effectiveness

The majority of colloidal silver manufacturers offer solutions between 10 and 25 ppm. After more than a year of research, Institut Katharos have accomplished what few others have achieved: Producing concentrated colloidal silver at 40 PPM via low-voltage electrolysis. This is of paramount importance since a more concentrated solution is more effective, as demonstrated by a peer-reviewed scientific study published in 2010 in the journal Applied Microbiology and Biotechnology.

Let's explain the acronym PPM: it means Parts Per Million. In reality, the ppm number is a proportion unit, just like a percentage, which could well be converted to “parts per hundred”.

In the context of colloidal silver, this means that in a 40 ppm colloidal silver solution, there are 40 milligrams of silver in 1 litre of purified water. Likewise, there are 20 milligrams of silver in 1 litre of 20 ppm colloidal silver.

Infinitely Small Ionic Particles for Better Results

Particle size is just as important as concentration: Institut Katharos colloidal silver contains 96% silver ions (dissolved in water) with an atomic size of less than one nanometre. The remaining 4% colloidal silver (suspended particles in water) is between 1 and 5 nanometres.

A study conducted in 2012 by researchers from the prestigious Rice University proved that it is the ions, not the particles, that have a purifying power. This solution is 96% ionic.

Superior concentration + smaller particles = Better Results!

Water of Extreme Purity

It must be pointed out that most other colloidal silver solutions contain type 2 or 3 ultrapure water, which can contain up to 100 times more bacteria than type 1 ultrapure water!

Institut Katharos chose the purest water available - Type 1 UltraPure Water. It is used for the most critical laboratory operations, as in molecular biology. In order to maintain this high level of purity, amber glass bottles are used.

Colloidal silver in its liquid form (silver + water) is also more effective than colloidal silver cream and gel products.

Pure, Concentrated, Effective

Solution Certified by 3 Independent Laboratories

Many companies have abused consumers' trust and are quick to supply solution containing less PPM than actually advertised. In order to demonstrate their earnestness, Institut Katharos have published all their analyses that certify their concentration at 40 PPM, as well as their use of Ultrapure water Type 1. Institut Katharos are the only company in the industry to share the results of their product analyses with consumers. 

Institut Katharos Colloidal Silver has been tested and certified by Flandres Analyses, AQUATICA and SPC.

Institut Katharos are Specialists and Produce their Solution Themselves

Some companies do not mind subcontracting the production of their colloidal silver at the expense of quality. Often, these same companies also offer dozens of other outsourced products.

Institut Katharos are proud to specialise in colloidal silver - in fact, they have been proudly producing and packaging their solution for many years. They are also fully and strictly ISO 22716 compliant.


Amber glass and recycled cardboard packaging

Are you ready to discover the purest colloidal silver ever made?

Thanks to its powerful concentration, extremely small particles and the purest water on earth, this ionic-colloidal silver solution is unique. More effective, natural and safe, this Colloidal Silver can be used daily for the whole family and as an antiseptic for your beloved animals (dogs, cats, horse...) to fight infections.

Choose Institut Katharos products for peace of mind!



UltraPure water (Type 1), Silver dosed at 40 ppm (including 96% ionic, 4% colloidal).

This Colloidal Silver solution contains 40 mg of silver per litre.


How to use it?

It is recommended to apply Institut Katharos Colloidal Silver at least 3 times a day to the desired area, and let it dry.

For more information on its use and dosage, refer to Institut Katharos' eBook.



What is the shelf-life?

This colloidal silver is conditioned in an inert amber glass bottle in order to guarantee the quality of the solution. Protect from light and store at room temperature.

There is no use-by date according to laboratory tests (the product keeps indefinitely). However, there is a ‘Use within’ period of 6 months: once the bottle is opened, you have 6 months to use it.


About Institut Katharos

Institut Katharos are a French company who specialise in producing the purest and most concentrated ionic colloidal silver. Silver has a long history of being used to accelerate healing. It was only recently (early 19th century) that silver was "miniaturised" in different forms to fight against many infections. Discover the secrets of this incredible product and learn more about Institut Katharos.

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Institut Katharos, Colloidal Silver 40 PPM Bottle, 1000 ml, + Free Spray 30 ml to fill

Institut Katharos, Colloidal Silver 40 PPM Bottle, 1000 ml, + Free Spray 30 ml to fill

100 Oral Servings with Dosing Cap (Free eBook provided)

Our Price: £48.99

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