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INCI ingredient

Sodium Bisulfite

Sodium Bisulfite appears on 6 ingredient lists in our database, most often in shampoos.

What it triggers

  • Vegan originYesno animal source
  • FragranceNonot a perfume ingredient
  • ParabenNonot a preservative of this family
  • SulfateNonot a sulfate surfactant
  • SiliconeNonot a silicone
  • AlcoholNonot a drying alcohol

What it does

Sodium Bisulfite appears on 6 ingredient lists in our database, most often in shampoos.

It does not belong to any of the six groups we check, so it never changes a verdict.

We have not written the plain-language note for this ingredient yet; the facts above come straight from how it is classified.

Functions: antioxidant, hair waving or straightening, preservative, reducing

In the EU ingredient database

Functions listed by CosIng
  • antioxidant
  • hair waving or straightening
  • preservative
  • reducing
  • antioxidant: Inhibiting reactions promoted by oxygen, thus avoiding oxidation and rancidity.
  • hair waving or straightening: Modifying the chemical structure of the hair, allowing it to be set in the style required (permanent waves or hair straightening).
  • preservative: Exclusively or mainly intended to inhibit the development of micro-organisms in the cosmetic product. All authorised preservatives are substances in the positive list of Annex V to the Cosmetics Regulation 1223/2009.
  • reducing: Changing the chemical nature of another ingredient by adding hydrogen (or removing oxygen).

CAS 7631-90-5 · EC 231-548-0

EU regulation

Listed in Annex V (ref. 9) of the EU Cosmetics Regulation, maximum concentration 0.2% (as free SO2). III/99 V/9

Source: CosIng, European Commission. Informative, no legal value; the regulation text is the reference.

Classification from the INCI name; product lists from Open Beauty Facts.Report a mistake