Database/Antioxidant/Sodium Sulfite
100% natural origin · ISO 16128

Is Sodium Sulfite natural?

Yes. A wholly inorganic sulfite salt from mineral sulfur and sodium, natural origin under ISO 16128.

INCI nameSodium Sulfite
CAS7757-83-7
FormulaNa2O3S · 126.05 Da
FunctionAntioxidant · Hair Waving Or Straightening
FeedstockManufactured by neutralising sulfur dioxide, sourced from mineral…

How we scored it

Inorganic mineral salt Na2SO3 from sulfur dioxide + sodium hydroxide/carbonate, both mineral → total/total = 1.0.
What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.

Where it comes from

Manufactured by neutralising sulfur dioxide, sourced from mineral sulfur, with sodium hydroxide or carbonate. Both feedstocks are mineral in origin.

In plain English

A reducing agent and antioxidant that protects formulas from oxidation and is used in hair-waving products to help break and reform hair bonds. It is an inorganic mineral salt made from sulfur dioxide and sodium.

CosIng definition: Sodium Sulfite is the inorganic salt that conforms to the formula:

Structure

2D structure of Sodium Sulfite

disodium;sulfite

PubChem CID 24437 ↗

References

  1. 1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
  2. 2Sodium Sulfite. PubChem CID 24437. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3SODIUM SULFITE. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4SODIUM SULFITE. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=SODIUM%20SULFITE