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BUTYL ISOVALERATE.

Optional CAS 109-19-3 / PERFUMING

A fruity ester compound that serves dual functions as a fragrance component and solubilizing agent in skincare formulations. Known for its distinctive sweet apple-like aroma, this ingredient helps mask undesirable odors while enhancing the solubility of active ingredients.

Perfuming Solvent Masking agent

Science

Functions primarily through olfactory enhancement, providing pleasant fragrance notes while acting as a specialty solvent to improve ingredient compatibility and formulation stability in oil-based systems.


Research

Medium confidence
Effective range 1–9%
Optimal

1.4%

Key findings

  1. 01 Demonstrated excellent skin tolerance with zero irritation or sensitization reactions in human patch testing protocols

Transparency

Not commonly dusted

As a specialty fragrance and solubilizing agent, this ingredient serves legitimate formulation purposes rather than being used for cosmetic dusting.


The Formula

Solubility
Oil
Optimal pH 4 – 7
0 7 14

Stability

Exhibits moderate alkaline stability but may darken with aging. Shows excellent stability in acidic conditions (pH 1-5) making it suitable for specialized applications.

Synergies

  • Oil-soluble actives
  • Fragrance compounds
  • Lipophilic ingredients

Conflicts

  • Strong oxidizing agents
  • Strong bases
  • Arsenic compounds
  • Isocyanates

Safety

CIR Status
Safe as used
Max tested
9%
Sensitization risk Low

Classified within the Alkyl Esters safety group with established safety profile. Typical usage averages 1.4% in finished products with maximum allowable concentration of 9% in concentrate formulations.


Your Skin

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

Our Assessment

Optional

A well-tolerated multifunctional ingredient that enhances product sensory experience while providing formulation benefits, though not essential for skin health outcomes.


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