INCI
Potassium Alum
Potassium Alum
A naturally occurring mineral salt commonly used in crystal deodorants. It forms a light, invisible layer on the skin surface that may help reduce the growth of odour-causing bacteria.

For over 20 years, our Classic Crystal Deodorant has been a trusted choice, helping customers feel fresh and protected day after day. Crafted from pure mineral salt, it remains a simple and effective option for modern skincare.
Just One Ingredient - This alum stone is crafted from only potassium alum, a naturally occurring mineral salt. This crystal deodorant sits lightly on the skin creating a protective layer that helps to effectively neutralise the growth of odour-causing bacteria without clogging pores.
£6.49
Get updates, offers & more straight to your inbox. 10% off your first order for new signups.
© 2023–present Salt of the Earth . All rights reserved.
Tap a certification to learn more
Learn more about natural care related to Crystal Deodorant Classic
Common questions about Crystal Deodorant Classic
Still have questions? Contact our team
Crystal Deodorant Classic has received 2 awards


Swipe to browse awards


A closer look at standout ingredients in this formula
INCI
Potassium Alum
A naturally occurring mineral salt commonly used in crystal deodorants. It forms a light, invisible layer on the skin surface that may help reduce the growth of odour-causing bacteria.
COSMOS certified ingredients from natural sources
Tap any ingredient to learn more
Real feedback from 164 verified customers
164 reviews
94% recommend this product
I must admit, I had doubts about using a natural deodorant over the traditional spray I'd used for over 40 years, but I'm a convert. The crystal from Salt of the Earth really works. No odour whatsoever, whereas you do sweat more which is the bodies natural response to heat or stress. From online research I understand that aluminium based deodorants basically block up pores to prevent sweat coming out, and mask odour with artificial fragrance. I like that this product allows the body to function as designed, kills the bacteria that causes odour while allowing sweating and is fragrance free. Highly recommended to anyone on the fence about this product. It works, it's sustainable, it's vegan & it comes from a family owned company. What's more to like? Oh it last's for ever - literally months of use from one crystal :)
— Paul Booth
Sean
13 Feb 2026
I have used this product once every morning in Indonesia for two weeks, where it has been 30C+ (86F) / 80% humidity and I haven't once had a single hint of B.O the entire time. This is honestly th...
Paul Booth
29 Jul 2024
I must admit, I had doubts about using a natural deodorant over the traditional spray I'd used for over 40 years, but I'm a convert. The crystal from Salt of the Earth really works. No odour whatsoev...
Mark Bryan
29 Apr 2024
I suffer with allergies to deodorants as they contain harsh chemicals and high fragrance which trigger my asthma. I now have a deodorant that works without the overwhelming fragrance that comes with...

Donna Perry
11 Apr 2024
Brought this for my 7 year old and was apprehensive that it would work but oh my gosh it’s amazing no sweat smell at all following application and love that its natural for my little one amazing produ...
Leo Phillips
21 Dec 2023
Switched to using Salt of the Earth's natural crystal deodorant during 2020, having been a staunch anti-perspirant user. It does take time for you and your body to adapt but stick with it and you'l...
Lex
26 Sept 2023
I am using the salt deodorant for some time now and it is great! No odour whatsoever, even after exercise! And the customer service is amazing, I had some unexpected shipping costs I had to pay to the...
Swipe to browse reviews
Sean
13 Feb 2026
I have used this product once every morning in Indonesia for two weeks, where it has been 30C+ (86F) / 80% humidity and I haven't once had a single hint of B.O the entire time. This is honestly th...
Paul Booth
29 Jul 2024
I must admit, I had doubts about using a natural deodorant over the traditional spray I'd used for over 40 years, but I'm a convert. The crystal from Salt of the Earth really works. No odour whatsoev...
Mark Bryan
29 Apr 2024
I suffer with allergies to deodorants as they contain harsh chemicals and high fragrance which trigger my asthma. I now have a deodorant that works without the overwhelming fragrance that comes with...

Donna Perry
11 Apr 2024
Brought this for my 7 year old and was apprehensive that it would work but oh my gosh it’s amazing no sweat smell at all following application and love that its natural for my little one amazing produ...
Leo Phillips
21 Dec 2023
Switched to using Salt of the Earth's natural crystal deodorant during 2020, having been a staunch anti-perspirant user. It does take time for you and your body to adapt but stick with it and you'l...
Lex
26 Sept 2023
I am using the salt deodorant for some time now and it is great! No odour whatsoever, even after exercise! And the customer service is amazing, I had some unexpected shipping costs I had to pay to the...