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BUTYL 2-METHYLBUTYRATE.

Optional CAS 15706-73-7 / PERFUMING

A branched-chain fatty acid ester that serves as a fragrance component, delivering fruity and apple-like scent notes to skincare formulations. This oil-soluble ingredient functions primarily as a masking agent to neutralize unpleasant odors from other actives while contributing minor emollient properties.

perfuming masking

Science

Functions by stimulating olfactory receptors to provide sensorial benefits, while its ester structure allows for mild skin-softening effects through temporary surface conditioning.


Research

High confidence
Effective range 0.014–5%
Optimal

0.014%

Key findings

  1. 01 Demonstrated non-sensitizing and non-irritating properties at typical cosmetic usage levels, with negative results for genotoxicity and reproductive toxicity

Transparency

Not commonly dusted

Not applicable as this ingredient serves a functional sensorial role rather than therapeutic benefits


The Formula

Solubility
Oil
Optimal pH 4 – 7
0 7 14

Stability

Susceptible to ester hydrolysis under extreme pH conditions (below 3.0 or above 9.0), but remains stable in typical skincare emulsions at ambient temperatures

Conflicts

  • Strong oxidizing agents
  • Strong bases (alkalis)
  • Strong acids

Safety

CIR Status
Not reviewed by CIR but listed on IFRA Transparency List
Max tested
5%
Pregnancy
Safe
Sensitization risk Low

Classified as Cramer Class I (low oral toxicity) by RIFM and recognized as GRAS by FDA for ingestion as flavoring agent


Your Skin

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

Our Assessment

Optional

A safe and well-tolerated fragrance ingredient that enhances product sensorial experience without significant skincare benefits.


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References