pH regulator. In small amounts neutralizes formula acids, safe.
Topical application
BLimited evidence. One RCT or several controlled studies with limitations.
Simple pH regulator. Present in trace amounts in the finished product.
Sodium Carbonate (E500, soda ash) is an inorganic salt and pH regulator. In cosmetics – a component for neutralizing formula acidity, used in small amounts for fine pH adjustment. Where applied. In AHA/BHA chemical peels – for target pH control, in soap and surfactant products – to adjust pH toward alkaline, in toothpastes – as a mild abrasive and buffer. Cosmetic concentration 0.1-2%. Safety. CIR confirmed sodium carbonate safety in cosmetics (Final Report 2002). At concentrations above 5% it can irritate skin and mucosa due to high alkalinity. At typical cosmetic concentrations <2% – safe. Not systemically absorbed through intact skin. Soap controversy. Traditional soap (saponification of fats with alkali) has pH 9-10 due to residual sodium carbonates. This disrupts the skin's acid mantle (pH 4.7-5.5), which for healthy skin is temporary discomfort, but for dry, atopic, sensitive skin – a flare factor. Modern syndet face washes use synthetic surfactants at pH 5-6, without sodium carbonate. Pregnancy and lactation – safe. Food additive E500, no cosmetic restrictions.
Irritation potential
LowAllergen risk
LowPregnancy
SafeSuitable for
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Sodium Carbonate is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
Sodium Carbonate suits: normal, dry, oily, combination, sensitive.
pH regulator.
The INCI name is Sodium Carbonate. It may also appear as: E500, Soda Ash.
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