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ph-adjuster

Sodium Hydroxide

Generally safe·Strong evidence

A strong alkali used in tiny amounts to adjust the pH of cosmetics to safe, skin-friendly levels. At the pH found in finished products, sodium hydroxide is neutralized and well tolerated.

Questions

Is sodium hydroxide safe in skincare?
Sodium hydroxide is used in tiny amounts to adjust pH and neutralize acids in cosmetics. In the finished product, it is not present in hazardous form and published safety reviews do not identify concerns.
Why is sodium hydroxide in cosmetics?
It neutralizes acidic ingredients to create a pH that is safe and comfortable for skin. You will see it in products that contain chemical exfoliants or other actives that need pH adjustment.
Can sodium hydroxide burn skin?
Sodium hydroxide as a pure chemical is corrosive and hazardous. However, in finished cosmetic products, it's used only in amounts needed to neutralize acids, and the final pH is tested to ensure safety.

Products with Sodium Hydroxide

References

Cosmetic information for general education, not medical advice. A verdict is a reading of the published evidence, never a guarantee for your skin: any ingredient can irritate someone, so patch test new products and see a professional if you react. Concern is graded on cited evidence, never on hazard-score lists. See how we score.