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AMMONIUM BISULFITE.

Optional CAS 10192-30-0 / HAIR WAVING OR STRAIGHTENING, PRESERVATIVE, REDUCING

A water-soluble reducing agent that serves dual purposes in cosmetic formulations as both an antioxidant and preservative system. While primarily utilized in hair care applications for structural modification, it provides product stabilization benefits in skincare by neutralizing oxidizing agents that cause formulation degradation.

preservative antioxidant reducing agent

Science

Functions as a hydrogen-donating reducing agent that neutralizes oxidizing compounds, preventing product deterioration and extending shelf life. Its highly charged molecular structure limits skin penetration, while any absorbed material is rapidly metabolized to harmless sulfate compounds by endogenous enzymes.


Research

High confidence
Effective range 0.03–0.7%
Optimal

0.35%

Key findings

  1. 01 CIR Safety Assessment demonstrated safety at concentrations up to 32% in rinse-off applications
  2. 02 International Journal of Toxicology confirmed non-irritating properties at 38% concentration in occlusive testing

Transparency

Not commonly dusted

Not typically subject to dusting practices due to its specialized preservative and antioxidant functions requiring specific concentrations for efficacy


The Formula

Solubility
Water
Optimal pH 5 – 9
0 7 14

Stability

Maintains stability under standard conditions but exhibits high reactivity with oxidizing agents. Functions optimally at pH 8-9 in alkaline systems, while standard aqueous solutions naturally stabilize at pH 5.0-5.8.

Conflicts

  • Strong oxidizing agents
  • Strong acids (produces sulfur dioxide gas)
  • Strong bases (releases ammonia gas)
  • Metal ions (aluminum, copper, zinc and their alloys)

Safety

CIR Status
Safe as used
Max tested
32%
Pregnancy
Safe
Sensitization risk Low

Demonstrated safety profile supported by limited skin penetration and rapid metabolic conversion to non-toxic sulfate compounds. Current usage concentrations well within established safety margins.


Your Skin

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Optional

A specialized preservative and antioxidant ingredient with demonstrated safety but limited direct skincare benefits for most consumers.


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