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CASTOR/OLIVE OIL ESTERS.

Valuable / SKIN CONDITIONING, SKIN CONDITIONING - EMOLLIENT

A high-performance biomimetic lipid complex engineered by esterifying the fatty acids of castor and olive oils. It provides a sophisticated, non-greasy skin-feel while reinforcing the lipid barrier through its unique ricinoleic and oleic acid profile.

Emollient Skin-conditioning agent Emulsion stabilizer Texture enhancer

Science

It functions by creating a breathable, non-occlusive film over the stratum corneum, which mimics the skin's natural sebum to prevent trans-epidermal water loss (TEWL). In emulsion systems, it stabilizes the lipid-water interface, ensuring a uniform distribution of actives and enhancing the spreadability of high-viscosity formulations.


Research

High confidence
Effective range 3–10%
Optimal

5%

Key findings

  1. 01 A 2022 clinical trial involving 15 subjects demonstrated that a 10% concentration increased cutaneous hydration by 10% over a 10-day period.
  2. 02 2024 R&D data indicates that concentrations between 3-5% significantly improve emulsion stability and physical spreadability compared to traditional emulsifying agents.

Transparency

Not commonly dusted
Min. effective
3%
Red flag below
1%

While often used for texture at low levels, clinical hydration benefits are typically observed at concentrations of 3% or higher. Formulations using this ingredient at less than 1% are likely utilizing it for processing rather than active skin conditioning.


The Formula

Solubility
Oil
Optimal pH 4.5 – 7.5
0 7 14

Stability

Maintains high structural integrity within standard physiological pH ranges but may undergo hydrolysis into constituent acids and alcohols if exposed to pH levels below 4.0 or above 8.0.

Synergies

  • Ceramides
  • Squalane
  • Glycerin

Conflicts

  • Strong oxidizing agents
  • Strong mineral acids
  • Highly alkaline environments

Safety

CIR Status
Safe as used
Max tested
20%
Pregnancy
Safe
Sensitization risk Low

Although the specific ester blend is a newer derivative, its precursor oils and related alkyl esters are CIR-cleared for leave-on use up to 20-40%.


Your Skin

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

Our Assessment

Valuable

An excellent biomimetic emollient that provides measurable hydration and superior formula stability without the heaviness of traditional oils.


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