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Sodium Bisulfite

What Sodium Bisulfite is & what it does

Sodium Bisulfite is a sulfur-based inorganic salt used in cosmetic and skincare formulas mainly as an antioxidant and preservative aid. It helps protect a product from oxidation and can act as a reducing agent, which is why it also appears in some hair products and as a stabilizer for other ingredients. In a sunscreen or skincare formula it is typically present at low levels to keep the formulation stable rather than to provide a skin benefit.

Is Sodium Bisulfite safe in skincare?

Sodium Bisulfite is generally considered safe for use in cosmetics at the low levels typically used, where it acts as an antioxidant and stabilizer. Sulfite compounds can be a sensitivity concern for some individuals, so people who know they react to sulfites may want to review the label. Patch testing a new product is reasonable if you are unsure.

What does Sodium Bisulfite do in skincare?

Sodium Bisulfite is used mainly as an antioxidant and reducing agent, helping protect a formula from oxidation and keeping other ingredients stable. It is typically present at low levels for formula stability rather than as a skin active. It can also appear in some hair products for its reducing properties.

Is Sodium Bisulfite natural or synthetic?

Sodium Bisulfite is a synthetic inorganic salt produced through chemical processes. It is a sulfur-based compound manufactured for industrial, food, and cosmetic uses. It is not a botanical or naturally extracted ingredient.

Sunscreens with Sodium Bisulfite

We rate 11 sunscreens that contain it, showing the top 10 by overall score:

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