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BUTYL LAEVULINATE.

Optional CAS 2052-15-5 / PERFUMING

A bio-derived ester of levulinic acid that functions as a multitasking skin-conditioning solvent with gentle emollient properties. This sustainable alternative to petrochemical solvents enhances ingredient penetration while softening skin through its low-viscosity profile.

solvent skin conditioning penetration enhancer perfuming

Science

Functions as a bio-based solvent and penetration enhancer that delivers emollient benefits by forming a lightweight conditioning film on skin. Its ester structure allows it to act as a carrier for active ingredients while providing sustainable solvency power in formulations.


Research

Medium confidence
Effective range ≤4%
Optimal

N/A

Key findings

  1. 01 Human patch testing at 4% concentration showed no irritation or sensitization after 48-hour occlusion

Transparency

Not commonly dusted

Primary function as solvent and conditioning agent makes dusting unlikely in typical formulations


The Formula

Solubility
Both
Optimal pH 6.5 – 9
0 7 14

Stability

Maintains stability in alkaline conditions and oil phases but undergoes hydrolysis below pH 6.0, breaking down into levulinic acid and butanol

Synergies

  • Natural active extracts (acts as green extraction solvent)
  • Fragrance compounds (enhances fruity, caramel notes)

Conflicts

  • Strong oxidizing agents
  • Aldehydes in long-term storage
  • Acidic formulations below pH 6.0

Safety

CIR Status
Not reviewed
Max tested
4%
Sensitization risk Low

FDA GRAS-approved for food use and established 4% topical limit based on RIFM fragrance safety data. Classified as readily biodegradable with low toxicity profile.


Your Skin

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

Our Assessment

Optional

A sustainable, well-tolerated multifunctional ingredient ideal for green beauty formulations seeking effective solvency with conditioning benefits.


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