Sodium Bisulfite
Reviewed by Rosie · Last updated 18 Aug 2026
Used in acid-type permanent waves to alter hair shape | Less damaging than alkaline permanent waves
EWG Safety Score
What Is Sodium Bisulfite?
Used in acid-type permanent waves to alter the shape of hair. It is less damaging than alkaline permanent waves, but also has limitations regarding how much change it can effect in hair. It can be a skin sensitizer.
Benefits for Your Skin
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2-Bromo-2-Nitropropane-1,3-Diol
A synthetic preservative that helps prevent microbial contamination in skincare formulations
4-Ethylresorcinol
A resorcinol derivative with purifying and potential skin-lightening properties
Alcohol Denat.
Denatured alcohol, used as a solvent and to adjust texture
Aluminum Acetate
An astringent salt that helps reduce excess moisture and supports skin's protective barrier
Aluminum Diacetate
A mineral-derived ingredient with purifying and mild astringent properties
Aminolevulinic Acid Hcl
A precursor compound used in photodynamic therapy to target acne-causing bacteria
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