A polar emollient and skin-conditioning agent valued for its exceptionally cushiony skin feel and high-gloss finish. It excels at dispersing pigments in color cosmetics while providing a smooth, non-greasy barrier that limits trans-epidermal water loss.
- INCI Name:
- Diisostearyl Malate
- Chemical/Scientific Name:
- Bis(16-methylheptadecyl) 2-hydroxybutanedioate
- Common Aliases:
- Malic Acid Diisostearyl Ester
| Category: | Softeners |
| Source Origin: | Synthetic (derived from Isostearic Acid and malic acid) |
| Comedogenic Rating: | 1-2 |
| Primary Industries: | Color Cosmetics, Skincare, Hair Care |
| Solubility: | Oil-soluble |
At a Glance: Properties & Effects
| Texture Enhancement: | |
| Hydration/Moisture: | |
| Formula Stability: | |
| Irritation Risk: |
- Primary Benefits:
- Imparts a luxurious, silky slip to anhydrous (water-free) formulas.
- Enhances the color intensity and uniform distribution of Iron Oxides and Titanium Dioxide.
- Prevents pigment sedimentation and the “sweating” phenomenon in lipsticks.
- Provides a high-refractive index for superior gloss and shine.
- Potential Risks:
- Minimal risk of irritation; generally considered non-sensitizing even at high concentrations.
Biological Action & Cosmetic Profile
Molecular architecture defines the performance of this polar ester, which is created by the esterification of branched-chain fatty alcohols with malic acid. Its branched structure prevents the ingredient from solidifying at room temperature, allowing it to maintain a fluid, heavy-bodied consistency that mimics the richness of Ricinus Communis Seed Oil without the characteristic odor or potential for rancidity. This specific viscosity provides “staying power” on the skin surface, making it an ideal candidate for long-wear applications where a protective barrier is required.Pigment wetting efficiency remains a primary functional advantage for formulators. The polar nature of the molecule allows it to surround and stabilize mineral pigments more effectively than non-polar oils like Isododecane. By reducing the surface tension between solids and liquids, it ensures that makeup applies without streaking or clumping. On a structural level, it fills the micro-fissures in the stratum corneum, creating an immediate smoothing effect that enhances the visual appearance of skin texture.Sensory attributes distinguish this ingredient from lighter esters such as Caprylic/capric Triglyceride. It offers a “slow-cushion” feel, meaning it provides substantial resistance and richness during application before settling into a smooth, non-tacky film. This makes it particularly effective in night creams or heavy-duty lip balms where the user expects a sense of long-lasting nourishment.
Broader Applications & Origins
Chemical synthesis typically involves a controlled reaction between malic acid—a dicarboxylic acid found naturally in apples—and isostearyl alcohol. While the raw materials can be derived from plant sources like Stearic Acid, the final ingredient is a refined synthetic ester optimized for purity and oxidative stability. This stability is crucial for high-color products, as it ensures the formula does not develop off-flavors or change consistency over time.Lip care applications frequently utilize this ester as a primary vehicle for waxes and colorants. Its ability to provide a high-shine finish while maintaining a comfortable, emollient layer is superior to many traditional hydrocarbons. Outside of color cosmetics, it is found in prestige skincare emulsions to provide a “prestige” skin feel and to help stabilize the oil phase of the cream.
Routine Integration
- Synergies:
- Mineral Sunscreens: Helps improve the spreadability and minimize the white cast of inorganic UV filters.
- Lipstick Waxes: Pairs perfectly with heavy waxes to provide a creamy, easy-glide application.
- Pigment Concentrates: Enhances the load and vibrancy of decorative cosmetics.
Clinical Consensus & Safety
Dermatological safety assessments performed by the Cosmetic Ingredient Review (CIR) Expert Panel conclude that this ingredient is safe for use in cosmetic formulations. Their evaluation noted that the ester is not a skin irritant or sensitizer, even when used at concentrations as high as 82% in leave-on products like lipsticks. Because of its large molecular size and low potential for skin penetration, it is considered non-toxic and lacks systemic activity.
Is Diisostearyl Malate vegan?
Yes, in most modern cosmetic production, it is synthetic and derived from plant-based fatty acids, making it suitable for vegan-friendly formulations.
Does it cause acne or clogged pores?
While it is an oil-soluble ester, its comedogenic rating is low (1-2), meaning it is unlikely to cause breakouts for most skin types, though individuals with extremely oily skin should monitor its use in heavy creams.
Why is it found so often in lip gloss?
It is used because it has a high refractive index, which translates to a high-shine, glossy look, combined with a thick viscosity that prevents the gloss from migrating or bleeding into fine lines.