Verdan Switzerland specialist since 1980 in alum stone of potassium

pierre d'alun de potassium


The precursor of the cosmetic sustainable since 1980, Verdan Switzerland is the first company to raise awareness of the benefits of the deodorant mineral to the alum stone potassium. After 43 years of activity, Verdan is actively pursuing its commitment to a better use of resources. Today, the alum stone potassium grade A+ has established itself in the world as a natural active ingredient and is approved by Ecocert Cosmos Natural.


Deodorants are part of the cosmetics that pollute the planet. To combat this waste, Verdan offers cosmetics-zero-waste and/or rechargeable and recyclable. For example, the stone of alum potassiumour flagship product, offers a period of 365 days replacement not less than 12 deodorants

In a crystal we have clear evidence of the existence of a principle of life, and though we cannot understand the life of a crystal, it is nonetheless a living being.


Participate actively to increase the share of recycled products and durable in habits of personal care.


To create added value in respect of the balance of organic and physical health of our planet.

protection deodorant naturel transparent alun grade A+

Frequently Asked Questions

Here, you will find the answers to the most frequently asked questions on the alum stone potassium. If something is missing, please let us know. With pleasure, we will add more information.

You can find alum in all the continents of the world, and its quality varies according to its origin and of its preparation. Today, it is in Panama that comes to us from the alum stone is the most pure. The alum stone of Panama is approved 100 % natural by Ecocert Cosmos Natural

By its naturality, the alum stone can contain undesirable impurities which could make the stone opaque. A careful selection is necessary and sorting needs to be done. More a stone is transparent, so it will be pure and concentrated. On the other hand, the stone of alum synthetic are opaque. Regardless of the brand or the format of the stone of alum that you find, it will always be advisable to choose the stone, the more transparent. 

Yes, and much, much more than you think. It is a stone of alum and alum stone. Not all of them are natural and not all of them are of the same composition. They are all made of one of the following component : alum-potassium alum-ammonium alum-iron alum-chrome or salts of alum aluminum. Some alums are natural, others man-made, some are whitish other transparencies. Make the choice might seem difficult, but keep in mind that these can be guided easily like this. Lread the list of ingredients. If it is mentioned “potassium alum”, you already have the good category because it is a stone to the potassium. But this is not enough. Vyou must also check that your stone bears the seal of a certification body. One last tip, check that it is a stone of potassium, it should be choosing the most transparent way possible. The transparency of the alum stone is a synonym of purity. 

Yes and no. Not because she does not stop completely sweating. Its activity astringent ressere some of the pores of the skin thus reducing the sweat, but its main action is not to stop sweating if not eliminate them naturally and effectively with the odours of the body.

To apply, it is necessary to wet the stone or stick, and rub it for 5 to 10 seconds or as much as you want. A very thin film of minerals invisible and purposes are deposited on the surface of the skin. By their effect somewhat bactericidal, these minerals regulate the bacterial flora of your armpits, eliminating all the bad smells.

The denomination Grade A+ means that a selection process has been implemented. The stone of alum may contain impurities from natural, non-desirable, and that make the stone whitish. The selection consists of sorting and keeping the stones in the most transparent. A transparent stone so will be more concentrated and more secure in its composition.

You can get the alum stone in solid form, which is mainly used as a body deodorant and as an after-shave. But you can also get in pharmacy from the alum stone powder or in granules to prepare self-cosmetic recipes to lighten the skin tone, eliminate cellulite, rejuvenate the skin... Your pharmacist or chemist will inform you. You can also search the WEB you will discover no less than 15 different applications.