Ingredient
Sodium Sulfite
Sulfurous Acid Sodium Salt
What it is
Sodium Sulfite is an inorganic salt used in small amounts in cosmetic formulas to prevent discoloration and rancidity by scavenging oxygen. It is not a fragrance or active skincare ingredient but a behind-the-scenes stabilizer.
How it works
Acting as a reducing agent and oxygen scavenger, it readily donates electrons to oxidize itself preferentially, slowing the oxidative degradation of the formula's other ingredients.
What it does
Antioxidant
Concerns to know
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Contact allergen
Can act as a skin sensitiser for a minority of people; patch test if your skin is reactive.