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O-TOLUALDEHYDE.

Avoid CAS 529-20-4 / PERFUMING

O-Tolualdehyde, also known as 2-Methylbenzaldehyde, is an aromatic aldehyde primarily utilized as a fragrance and flavoring agent. It offers no defined beneficial actions for skin and is subject to stringent concentration limits in cosmetic applications due to its irritation and sensitization potential.

fragrance ingredient perfuming agent

Science

The mechanism of action for any beneficial skin effects of O-Tolualdehyde is not specifically defined. As an aldehyde, it is known to undergo oxidation and primarily functions as a scent and taste component in its common applications.


Research

Low confidence
Effective range N/A
Optimal

N/A


Transparency

Not commonly dusted

The Formula

Solubility
Both
Optimal pH N/A
0 7 14

Stability

O-Tolualdehyde is typically stabilized with 0.1% hydroquinone. For optimal stability, it should be stored in a dry, cool, and well-ventilated area, away from heat and ignition sources. It is slightly soluble in water (approximately 1178 mg/L at 25 °C) and readily soluble in various organic solvents including alcohol, ethanol, ethyl ether, benzene, and acetone.

Conflicts

  • strong oxidizing agents
  • strong bases
  • strong reducing agents
  • ketones
  • sulfuric acid
  • nitric acid
  • caustics
  • ammonia

Safety

CIR Status
Not reviewed
Max tested
0.025%
Sensitization risk High

O-Tolualdehyde is classified as harmful if ingested, capable of causing skin irritation, and serious eye irritation. It poses a risk for allergic skin reactions and respiratory irritation. The International Fragrance Association (IFRA) considers dermal sensitization a critical effect and imposes varying maximum concentration limits based on application site: 0.085% for lip products, 0.51% for face/body products applied with fingertips, and a stricter 0.025% for axillary products. The FDA recognizes its status as a flavoring agent.


Your Skin

No Normal
No Dry
No Oily
No Sensitive
Irritancy High
Comedogenicity Unknown

Our Assessment

Avoid

Given its lack of beneficial skin action, coupled with a high risk of irritation and dermal sensitization, O-Tolualdehyde is an ingredient that should be avoided in precision skincare formulations.


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