Sodium Carbonate

Sodium Carbonate, commonly known as soda ash or washing soda, is an inorganic alkaline salt that occurs naturally in mineral deposits or is synthetically produced. In cosmetic formulations, it serves primarily as a powerful pH adjuster to raise and buffer alkalinity, particularly in cleansing products, bath preparations, and hair relaxers where high pH is required. Formulators choose this ingredient for its strong alkalinity, water softening properties through calcium and magnesium sequestration, and cost-effectiveness compared to other pH adjusters, though it must be used carefully due to its high pH which can be irritating at elevated concentrations.