Sodium hydroxide is a strong alkaline compound used in cosmetics to adjust the pH of a product, ensuring it is safe and effective for skin. It is also essential in the saponification process for making true soap. In finished products, it is typically present in very low concentrations or has reacted completely.
NonePH adjusterVeganEvidence: High
BenefitNone 0 / 4
RiskLow 1 / 4
Irritation
Rated by SpottyLabs' ingredient methodology, independent of brands.
Things to watch
Highly corrosive in concentrated form
Can cause severe burns and irritation if not properly neutralized
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Frequently asked questions
Is sodium hydroxide safe in skincare products?
When used in cosmetic formulations, sodium hydroxide is carefully controlled to ensure the final product's pH is safe for skin. In most finished products, it is either present in very low, non-irritating concentrations or has been fully reacted, for example, in true soap making.
Why is sodium hydroxide listed if it's dangerous?
Sodium hydroxide is a potent ingredient that is crucial for specific formulation purposes, such as adjusting pH or creating soap. Its presence on an ingredient list indicates its use during manufacturing, but the final product is formulated to be safe and non-irritating.
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