Sodium Bisulfite ●
TL;DR. This ingredient is primarily a reducing antioxidant, used to protect formulas from oxidation, discoloration, and loss of oxygen-sensitive components. It may also appear in hair and depilatory systems where controlled reduction chemistry is useful.
What does Sodium Bisulfite do in a cosmetic formula?
This ingredient is primarily a reducing antioxidant, used to protect formulas from oxidation, discoloration, and loss of oxygen-sensitive components. It may also appear in hair and depilatory systems where controlled reduction chemistry is useful.
Is Sodium Bisulfite clean?
From a clean-beauty perspective, this ingredient is acceptable but not friction-free because sulfite-sensitive users can react to it, especially in leave-on or aerosol-adjacent formats. It is usually viewed as a functional stabilizer rather than a broad-spectrum preservative.
Is Sodium Bisulfite sustainable?
This material is an inorganic salt commonly made through industrial mineral and sulfur chemistry rather than renewable plant feedstocks. It is water-soluble and generally converts to sulfate in the environment, but high local discharges can increase oxygen demand in water systems.
Is Sodium Bisulfite COSMOS-approved?
It has partial alignment with COSMOS and Green Chemistry: it can be compatible in limited technical roles, but it is not a renewable or strongly nature-derived cosmetic ingredient. Its strengths are low use level and simple inorganic chemistry, while its weaker points are synthetic manufacture and sensitivity caveats.
How does Sodium Bisulfite work chemically?
The molecule is a small inorganic sulfur oxyanion salt with reducing behavior, so it is readily consumed by dissolved oxygen, peroxides, and other oxidants in water-based formulas. It is most relevant in aqueous systems, is pH-sensitive, and is generally used at low stabilizing levels, often well below 1%, with care around oxidizing ingredients and very low-pH formulas.
Last updated 2026-05-14