Disodium Laureth Sulfosuccinate is a high-performance, mild anionic surfactant that provides exceptional cleansing and foam stabilization without the irritation potential of traditional sulfates. Its large molecular structure prevents skin penetration, making it a preferred choice for sensitive skin formulations and color-protecting hair care products.
- INCI Name:
- Disodium Laureth Sulfosuccinate
- Chemical/Scientific Name:
- Butanedioic acid, 2-sulfo-, 1-[2-[2-(dodecyloxy)ethoxy]ethyl] ester, disodium salt
- Common Aliases:
- DLS, Sulfosuccinate, Ethoxylated Alcohol Sulfosuccinate
| Category: | Surface-Active Substances |
| Source Origin: | Synthetic (derived from ethoxylated fatty alcohols) |
| Comedogenic Rating: | 0 |
| Primary Industries: | Skin Care, Hair Care, Baby Care, Personal Hygiene |
| Solubility: | Water-soluble |
At a Glance: Properties & Effects
| Texture Enhancement: | |
| Barrier Repair: | |
| Irritation Risk: |
Primary Benefits:
- Produces a rich, creamy, and stable lather even in hard water.
- Cleanses effectively while maintaining the integrity of the epidermal lipid barrier.
- Acts as a non-sulfate alternative for “sulfate-free” product marketing.
- Reduces the overall irritation potential of secondary surfactants in a formula.
Potential Risks:
- Extremely low risk of contact dermatitis compared to alkyl sulfates.
- May cause mild eye stinging if used at high concentrations in rinse-off products.
Biological Action & Cosmetic Profile
The molecular architecture of Disodium Laureth Sulfosuccinate distinguishes it from harsh detergents like Sodium Lauryl Sulfate. Because the molecule is significantly larger, it is physically unable to penetrate the stratum corneum. This surface-level activity allows it to emulsify sebum and environmental debris effectively while leaving the underlying skin structure undisturbed. By preventing penetration, the ingredient avoids triggering the inflammatory cytokines typically associated with surfactant-induced irritation.
Aqueous solutions containing this substance exhibit excellent “flash foam” characteristics. Formulators often integrate it into Aqua based systems to improve the sensory experience of a cleanser. While it is an anionic surfactant, its polar head group is less aggressive toward keratin proteins. This characteristic ensures that hair fibers remain smoother and skin retains more of its natural moisturizing factors during the washing process.
Ethoxylation plays a critical role in the ingredient’s performance profile. The “Laureth” component indicates that the parent fatty alcohol has been treated with ethylene oxide, which increases water solubility and further enhances mildness. When combined with humectants like Glycerin, the resulting formula can achieve a deep clean without the tight, “squeaky” feeling that often indicates barrier disruption.
Broader Applications & Origins
This surfactant is widely utilized in professional hair care because it does not strip permanent hair dyes as aggressively as sulfate-based cleansers. Its ability to perform across a wide pH range makes it versatile for different product types. In baby care, it is a staple for “tear-free” shampoos due to its high dermatological and ocular compatibility. Manufacturing involves the reaction of maleic anhydride with ethoxylated lauryl alcohol, followed by sulfonating the intermediate with sodium bisulfite.
Routine Integration
Synergies:
- Works optimally with Coco Betaine to create dense, luxurious foam structures.
- Enhances the mildness of Sodium Cocoyl Isethionate in solid cleanser bars.
- Functions well alongside film-formers like Panthenol to improve hair manageability.
- Stable in formulas adjusted with Citric Acid for physiological pH balancing.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated the safety of Disodium Laureth Sulfosuccinate multiple times, most recently confirming its safety in rinse-off applications. Clinical data suggests that even at high concentrations, it exhibits a significantly lower Irritation Score than standard anionic surfactants in patch testing. Regulatory bodies in the EU (CosIng) and the United States classify it as a safe cosmetic ingredient when formulated to be non-irritating to the eyes and skin.
Is Disodium Laureth Sulfosuccinate a sulfate?
No, it is a sulfosuccinate. While the names sound similar, the sulfur atom is linked differently in the molecule, making it chemically distinct and much milder than sulfates like SLS or SLES.
Is this ingredient safe for color-treated hair?
Yes, it is highly recommended for color-treated hair. Because of its large molecular size and gentle action, it does not lift the hair cuticle as much as harsher surfactants, helping to preserve pigment longevity.
Can it be used in leave-on products?
While primarily used in rinse-off products like face washes and shampoos, it is occasionally used in leave-on products at very low concentrations. However, its main function is cleansing, which requires rinsing.