Magnesium Chloride vs Epsom Salt

Both magnesium chloride and Epsom salt (magnesium sulfate) are popular bath additives, but they differ significantly in their effectiveness.

Chemical Differences

Magnesium Chloride (MgCl₂) - Molecular weight: 95.21 g/mol - Solubility: Highly soluble - Ions released: Mg²⁺ and Cl⁻

Epsom Salt (MgSO₄) - Molecular weight: 120.37 g/mol - Solubility: Moderately soluble - Ions released: Mg²⁺ and SO₄²⁻

Absorption Comparison

Studies have shown that magnesium chloride is absorbed up to 5x more effectively through the skin than magnesium sulfate.

Why the Difference? - **Smaller molecular size**: Easier penetration through skin - **Higher ionic charge density**: Better interaction with skin - **Chloride ion compatibility**: Chloride is naturally present in skin

Therapeutic Implications

For athletes, this means: - More magnesium delivered per session - Faster results: Muscle relaxation occurs more quickly - Better value: You need less product for the same effect

The Cold Factor

In ice baths specifically, magnesium chloride maintains its solubility and absorption properties better than Epsom salt, which can precipitate out in very cold water.

Our Choice

ThermoPure™ uses pharmaceutical-grade magnesium chloride precisely because of these superior absorption characteristics.