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AMINOETHANESULFINIC ACID.

Valuable CAS 300-84-5 / ANTIOXIDANT, REDUCING

Aminoethanesulfinic Acid, also known as Hypotaurine, is a powerful endogenous antioxidant and cellular osmoregulator. It protects skin cells from oxidative stress while maintaining optimal hydration and cellular homeostasis.

Antioxidant Osmoregulator Soothing Anti-inflammatory Skin Repair Formulation Stabilizer

Science

As a potent antioxidant, Hypotaurine efficiently neutralizes singlet oxygen and other reactive species, safeguarding cellular integrity and mitochondrial function. It also acts as an osmoregulator, maintaining cellular hydration and stabilizing cell membranes, and functions as a reducing agent to stabilize other actives.


Research

High confidence
Effective range 0.001–1%
Optimal

0.1%

Key findings

  1. 01 At 0.01-0.1%, it effectively stabilizes cosmetic compositions and provides antioxidant protection by neutralizing singlet oxygen.
  2. 02 Concentrations of 0.1-1.0% are clinically utilized for cellular osmoregulation, antioxidant defense, and maintaining homeostasis under environmental stress.
  3. 03 Even at 0.001% as part of a complex, it demonstrated significant skin repair (HSP-27 induction) and reduced inflammation (IL-1α inhibition).

Transparency

Not commonly dusted

The Formula

Solubility
Water
Optimal pH 4.1 – 7
0 7 14

Stability

Highly stable in aqueous solutions, Hypotaurine often enhances the stability of other sensitive actives. Optimal formulation pH for stability and efficacy ranges from 4.1 to 7.0.

Synergies

  • Unstable active ingredients

Conflicts

  • Strong oxidizing agents

Safety

CIR Status
Not reviewed
Max tested
1%
Sensitization risk Low

An endogenous amino acid metabolite, Hypotaurine is generally considered safe for cosmetic use, despite not being specifically reviewed by CIR. It is safely employed in various commercial skincare products.


Your Skin

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Valuable

Hypotaurine is a valuable ingredient offering multifaceted protection through powerful antioxidant action, cellular hydration, and soothing benefits, suitable for all skin types.


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