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DENATONIUM BENZOATE.

Valuable CAS 3734-33-6 / DENATURANT, FRAGRANCE

Widely recognized as the most bitter compound known to science, this synthetic salt is primarily utilized in skincare as a denaturant to prevent accidental ingestion. It ensures product safety by imparting an intensely unpleasant taste at microscopic concentrations without altering the formulation's efficacy.

denaturant masking agent astringent viscosity controlling antifoaming

Science

It operates by activating TAS2Rs (type 2 bitter taste receptors), triggering an immediate oral aversion response. In topical applications, it functions as a functional additive that can provide secondary benefits such as viscosity reduction, astringency, and anti-foaming properties.


Research

High confidence
Effective range 0.000005–0.05%
Optimal

0.0006%

Key findings

  1. 01 Detected at concentrations as low as 50 ppb (0.000005%) in aqueous solutions.
  2. 02 Achieves effective alcohol denaturation at levels of 0.0006% according to CIR data.
  3. 03 Becomes intensely unpalatable at 10 ppm (0.001%), effectively deterring ingestion.

Transparency

Not commonly dusted
Min. effective
0.0006%
Red flag below
0.1%

Because it is effective at parts-per-billion (ppb) levels, very low percentages are functional. It is not an 'active' ingredient in the traditional sense, so low concentrations are expected and necessary for safety.


The Formula

Solubility
Both
Optimal pH 6.5 – 7.5
0 7 14

Stability

Highly stable in both aqueous and alcoholic solutions; maintains its properties over long periods and is unaffected by light exposure.

Synergies

  • Ethanol
  • Isopropyl Alcohol

Conflicts

  • Strong acids
  • Strong bases
  • Oxidizing agents (nitrates, chlorine bleach)

Safety

CIR Status
Safe as used
Max tested
0.05%
Pregnancy
Safe
Sensitization risk Low

Classified as safe by the CIR Expert Panel when used as a denaturant. While the raw material is an irritant, it is considered harmless to skin at standard cosmetic concentrations (e.g., 0.0006%).


Your Skin

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

Our Assessment

Valuable

An essential safety additive for alcohol-based precision formulas to prevent accidental oral exposure.


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