Is Salt of the Earth Classic Natural Deodorant Crystal safe for sensitive or acne‑prone skin?

The core ingredient, potassium alum, is generally gentle and non‑comedogenic, making it suitable for most skin types, but the presence of the preservative sodium metabisulphite (E522) may trigger irritation in highly sensitive individuals, so a patch test is recommended.

What role does potassium alum play in this deodorant and how does it work?

Potassium alum is a mineral salt that creates a thin, invisible layer on the skin, inhibiting bacterial growth that causes odor while allowing perspiration to evaporate, providing odor control without blocking sweat glands.

How often should the deodorant be applied and does it contain any controversial chemicals?

Apply a small amount to clean, dry underarms once daily or after heavy sweating; the formula is free of aluminium chlorohydrate but includes the preservative sodium metabisulphite (E522), which some users consider a controversial additive due to potential skin sensitivity.

Crystal Sping • 90g

Salt of the Earth Classic Natural Deodorant Crystal

Hygiene

Product Insights

Salt of the Earth Classic Natural Deodorant Crystal is a 90 g stick formulated primarily with potassium alum, a natural mineral salt known for its astringent properties. It offers a fragrance‑free, aluminum‑chloride‑free alternative to conventional antiperspirants and is marketed as vegan‑friendly, though vegan status is not confirmed. The formula includes the preservative E522 (sodium metabisulphite), which can cause irritation for sensitive skin, and it is packaged in non‑recyclable plastic, with manufacturing in China.

Comparative Analysis

Positioned in the natural crystal deodorant niche, this product differentiates itself by using 100 % potassium alum as the active deodorising agent and presenting a compact plastic stick, appealing to consumers seeking an aluminum‑free, fragrance‑free option.

Ingredients

Potassium Alum (a natural mineral salt)

84%

35%

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Frequently Asked Questions

Everything you need to know about Salt of the Earth Classic Natural Deodorant Crystal.

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Crystal Sping • 90g

Salt of the Earth Classic Natural Deodorant Crystal

Hygiene

Product Insights

Comparative Analysis

Ingredients

Potassium Alum (a natural mineral salt)

84%

35%

Unlock Deep Cosmetic Safety Check

Scan this and millions of other cosmetics with the free NutrScan app to discover ingredient safety, potential concerns, and detailed product analysis before every purchase.