INCI · preservative · CIR review pending · used in 2 products
Sodium Sulfite
Sodium Sulfite (CAS #7757-83-7) is an inorganic salt used in cosmetic and personal care formulations. According to CosIng, its listed functions are preservative and hair waving or straightening. It is subject to cosmetic restrictions (III/99, V/9), indicating regulated use conditions in certain markets.
Evidence level
weakEWG score
—Comedogenic
—Category
preservative● Benefits
Sodium Sulfite serves primarily as a preservative in cosmetic formulations, helping to protect products from oxidative degradation. It is also used in hair waving or straightening applications.
preservative
● Cautions
Subject to cosmetic use restrictions (III/99, V/9); regulated limits apply in certain markets. May cause sensitization or allergic reactions in some individuals. Use is restricted, so concentration limits should be observed.
