Researched by Helena DeMaria-Williams
Formula IngredientAntioxidant, PreservativeSodium Metabisulfite
INCI: Sodium Metabisulfite
Sodium Metabisulfite (also known as disodium disulphite) is an inorganic compound used in cosmetics as an antioxidant, preservative, and reducing agent. It prevents oxidative degradation of formulation ingredients, extending product shelf life and maintaining efficacy of oxidation-sensitive actives such as vitamin C. It is subject to EU CosIng restrictions (Annex III/99 and Annex V/9) regarding maximum permitted concentrations.
Category
Antioxidant, Preservative
Irritation Risk
Medium
Skin Types
all skin types (at regulated concentrations)
What does this do in a formula?
antioxidant protection, preservative, formulation stability, prevents oxidative degradation
Is Sodium Metabisulfite safe? Key considerations
Can Sodium Metabisulfite cause irritation?
Medium RiskEWG rates sodium metabisulfite as moderate hazard (score 2-4). CIR rating of A (safe as used). It is a known sensitiser for sulphite-sensitive individuals and can trigger reactions in people with asthma or sulphite allergy. EU CosIng restricts its use under Annex III/99 and Annex V/9. At typical cosmetic concentrations it is generally well tolerated by non-sensitive individuals.
Does Sodium Metabisulfite increase sun sensitivity?
No RiskSodium metabisulfite does not increase photosensitivity. No sun protection precautions are required based on its presence.
Is Sodium Metabisulfite safe during pregnancy?
CautionMANUAL REVIEW: No specific pregnancy safety data found for topical sodium metabisulfite. CIR rates it as safe for cosmetic use (rating A). Used at low concentrations as a preservative/antioxidant. Consult a healthcare provider if concerned.
How does Sodium Metabisulfite work?
Sodium Metabisulfite (also known as disodium disulphite) is an inorganic compound used in cosmetics as an antioxidant, preservative, and reducing agent. It prevents oxidative degradation of formulation ingredients, extending product shelf life and maintaining efficacy of oxidation-sensitive actives such as vitamin C. It is subject to EU CosIng restrictions (Annex III/99 and Annex V/9) regarding maximum permitted concentrations.
Individuals with sulphite allergy, asthma triggered by sulphites should review the considerations above before use.
Which products contain Sodium Metabisulfite?
Shop products that contain Sodium Metabisulfite
15% Vitamin C + EGF Serum
Blemish Clearing Moisturiser with 2% Novoretin
C-50 Blemish Night Treatment
Cetaphil Gentle Clear Pimple Patches
