Science
Mechanism of Action
This amphiphilic molecule functions as a non-ionic surfactant and co-emulsifier, anchoring oil droplets within water-based systems. Upon application, it releases ricinoleic acid to the skin, which softens the stratum corneum and creates a breathable film that significantly reduces transepidermal water loss (TEWL).
Research
Clinical Evidence
High confidence5%
Key findings
- 01 A clinical study on lip care demonstrated a 188% increase in hydration shortly after application and a 180% improvement in lip plumpness over 14 days.
- 02 2023 research involving 22 subjects indicated that derivatives of castor oil are effective in visibly reducing the appearance of infraorbital hyperpigmentation (dark circles).
Transparency
Dusting Analysis
While often used as a functional emulsifier at low levels (0.5%), clinical benefits for hydration and dark circles are typically observed when included as a core part of the formula's lipid phase.
The Formula
Formulation
Stability
Highly resistant to oxidative rancidity; acts as a 'solubilizing oil' for fragrances. It is water-dispersible, making it ideal for micellar and hybrid systems.
Synergies
- Essential oils
- Lipophilic actives
- Humectants
Conflicts
- Strong oxidizing agents
- Strongly acidic environments (pH < 4.0)
Safety
Safety Profile
Recognized as safe even for infant skincare at concentrations up to 2%. Previous 5% restrictions for leave-on products were removed in 2016 following data showing no sensitization at much higher levels.
Your Skin
Skin Compatibility
Our Assessment
Verdict
An exceptionally versatile, low-irritancy emollient that excels in both skin-plumping hydration and stabilizing delicate aqueous-lipid emulsions.
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References
Sources