Crystal deodorant in the fact check: effectiveness, pH balance and safety

More and more people are looking for alternatives to conventional

Deodorants – free of aluminum chloride, parabens, and artificial additives. One solution that has been around for centuries but is now gaining popularity again is the crystal deodorant stone . But what makes this stone so special?

🌱 What is crystal deodorant?

A crystal deodorant is made from potassium alum , a naturally occurring mineral salt. When the stone is slightly moistened and applied to the skin, an invisible layer forms. This prevents the growth of odor-causing bacteria—without blocking the sweat glands.

The result: freshness without disturbing the skin's natural function.

🔬 Why pH is crucial

The effectiveness of potassium alum is strongly related to its pH value :

• Potassium alum has a pH of about 3.0 to 3.5 .

• A lower pH value means a higher antibacterial effect – even small differences have a noticeable effect.

  
  

👉 It is precisely this low pH value that explains why crystal deodorants are so effective against odor formation: They do not interfere with the production of perspiration, but specifically inhibit the bacteria responsible for odor.

🧪 Potassium alum or aluminum chloride – what’s the difference?

One of the most common questions is: Does a crystal deodorant contain aluminum?

• Conventional deodorants containing aluminum chloride (ACH) block sweat glands and can cause skin irritation.

• In recent years, aluminum chloride in antiperspirants has been suspected of increasing the risk of breast cancer. To date, there is no reliable scientific evidence for this.

  • The Federal Institute for Risk Assessment (BfR) writes that any adverse health effects from absorption through the skin are unlikely , since the aluminum exposure from antiperspirants is much lower than previously assumed.

  • Even international professional societies, such as the American Cancer Society , do not yet see a clear connection between aluminum chloride in deodorants and cancer.

• Crystal deodorant, on the other hand, contains natural potassium alum : it has a larger molecular structure that cannot be absorbed through the skin .

  
  

👉 In short: 0% aluminum chloride – 100% natural mineral.

🔎 The secret lies inside our mineral stone

A closer look reveals a fascinating detail: At the core, potassium alum grows in a highly ordered structure with a geometric angle of 52 degrees – comparable to the Great Pyramid of Giza. This perfect crystal growth is called kalunite . Tests prove that kalunite achieves a particularly low pH of 3.0 – and thus the highest effectiveness against odor-causing bacteria. While cheaper competitor products often appear cloudy and milky, our stone is characterized by its almost crystal-clear transparency – like a real crystal. Biork relies on high-quality crystal stones from Central America. These are milled from a single piece, unlike cheaper Asian versions, which are pressed from many "grains." A potassium alum stone consists of a base, a core, and an outer shell. Biork uses only the pure core – this makes the stone crystal-clear, durable, and resistant to breakage, whereas inferior stones appear cloudy and crumble more easily.

🌍 Naturalness with added value

A crystal deodorant offers many advantages:

• Gentle on the skin: no burning, no residue

• Sustainable: often lasts over a year

• Climate-friendly: no plastic packaging, no microplastics

• Simple: Water + Stone, nothing more is needed

• Odorless: no perfume or artificial fragrances

💚 Why we rely on Biork

Ultimately, the question remains: Which crystal deodorant best meets these requirements? Biork uses only the heart of the crystal , where the purity is highest and the pH value is most stable. This makes the stone particularly long-lasting and effective. Combined with sustainable cork packaging, Biork is not only a healthy choice for you, but also a win-win for our planet.

👉 Biork – naturally fresh, scientifically effective, sustainably packaged.