Sodium metabisulfite is an inorganic salt used in cosmetic and topical formulations primarily as an antioxidant and preservative to prevent oxidation and discoloration of products. It releases sulfur dioxide, which helps stabilize sensitive ingredients.
| Reported effect | How often | Notes |
|---|---|---|
| Allergic contact dermatitis | Uncommon | Sulfites are recognized contact allergens; reactions appear as eczematous rash at application site. |
| Skin irritation | Uncommon | Can cause redness, stinging, or burning, particularly in sensitive or compromised skin. |
| Contact urticaria | Rare | Immediate hives-type reaction reported in sensitized individuals. |
| Systemic hypersensitivity reactions | Very rare | Sulfite-sensitive individuals (often with asthma) may rarely experience broader allergic responses. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.