Sodium Bisulfite

Sodium Bisulfite

AKA “7631-90-5, Sodium hydrogen sulfite, sodium hydrogensulfite, Sodium bisulphite, Monosodium sulfite, Sulfurous acid, monosodium salt, Sodium sulhydrate, Uantax SBS, Hydrogen sodium sulfite”

Preservative

Ingredient Facts

Sodium bisulfite

AKA: 7631-90-5, Sodium hydrogen sulfite, Sodium hydrogensulfite, Sodium bisulphite, Monosodium sulfite, Sulfurous acid, Monosodium salt, Sodium sulhydrate, Uantax SBS, Hydrogen sodium sulfite

Preservative · Antioxidant · EWG: 5

Synthetic

Antioxidant

Preservative

Medicated Active

Not Clean

Sodium hydrogensulfite is an inorganic sodium salt having hydrogensulfite as the counterion. It has a role as a mutagen, an allergen, a reducing agent, a food antioxidant and a food colour retention agent. It is an inorganic sodium salt and a sulfite salt. It contains a hydrogensulfite.

Solubility 29 % (NIOSH, 2024)

Formula

HNaO3S

Mol. Weight

104.06

CAS #

7631-90-5

Form

Powder

State

Sodium bisulfite appears as white crystals or crystalline powder. Slight sulfurous odor. Specific gravity 1.48. Strong irritant to skin and tissue.

See origin →

Functions

Antioxidant

Fights free radicals — the unstable molecules from UV, pollution, and stress that break down collagen and cause premature aging.

Hair Waving Or Straightening

Preservative

Keeps your product from growing bacteria, mold, or yeast. Without these, that jar of cream becomes a petri dish in about a week.

Reducing

Neutralizes Free Radicals

Traditional Use

Used since the 19th century as a preservative and antioxidant in food and cosmetics. Employed in skincare formulations to prevent oxidation of sensitive ingredients and extend product shelf life.