C12-13 Pareth-23

C12-13 Pareth-23 is a versatile synthetic emulsifier and surfactant used to stabilize cosmetic formulations. By bridging the gap between oil and water phases, it ensures uniform texture and prevents ingredient separation in cleansers and creams.

INCI Name:

C12-13 Pareth-23

Chemical/Scientific Name:

Polyethylene glycol ether of a mixture of synthetic C12-13 fatty alcohols (average 23 moles of ethylene oxide).

Common Aliases:

PEG-23 C12-13 Alcohols, Polyoxyethylene (23) C12-13 Alcohols.

Category:	Emulsifiers
Source Origin:	Synthetic
Comedogenic Rating:	N/A
Primary Industries:	Skin Care, Hair Care, Shaving Products
Solubility:	Water-soluble

At a Glance: Properties & Effects

Formula Stability
Texture Enhancement
Irritation Risk

Primary Benefits:

• Improves product stability by preventing phase separation.
• Functions as an effective solubilizer for fragrances and essential oils.
• Enhances the spreadability of thick creams and lotions.
• Supports consistent foaming in rinse-off cleansing systems.

Potential Risks:

• Can increase the skin penetration of other ingredients, which may be problematic if irritants are present.
• Potential for trace 1,4-dioxane contamination if not properly purified by the manufacturer.

Biological Action & Cosmetic Profile

Ethoxylated fatty alcohols like this one function by reducing the interfacial tension between aqueous and non-aqueous phases. The molecule consists of a hydrophobic carbon chain (C12-13) and a hydrophilic polyethylene glycol (PEG) chain. This amphiphilic structure allows the ingredient to orient itself at the boundary of oil and Aqua, creating a stable micellar environment.High-HLB (Hydrophilic-Lipophilic Balance) values characterize this specific variant due to the 23 moles of ethylene oxide. This makes it particularly effective at creating oil-in-water emulsions. In these systems, small oil droplets are dispersed throughout a water base, resulting in lightweight, non-greasy textures that are aesthetically pleasing to the consumer.Cleansing applications benefit from the ability of these surfactants to sequester sebum and environmental debris. When applied to the skin, the hydrophobic tails attach to oils, while the hydrophilic heads remain attracted to water. Upon rinsing, the surfactant lifts the trapped impurities away from the skin surface, ensuring a thorough clean without the harshness associated with high-sulfate detergents.

Broader Applications & Origins

Synthetic manufacturing processes ensure that C12-13 Pareth-23 maintains a consistent purity profile and molecular weight distribution. Unlike plant-derived surfactants, which may vary based on seasonal harvests, synthetic “pareths” offer predictable performance in complex formulations. This reliability is why the ingredient is frequently found in clinical-grade moisturizers and professional hair care products.Shaving gels often utilize this ingredient to maintain the stability of the propellant and the lubricant base. It ensures that the foam remains dense and consistent throughout the application. In leave-on products, it helps solubilize lipid-heavy actives like Dimethicone or various botanical oils into a water-based serum or lotion.

Routine Integration

Synergies:

• Works efficiently alongside thickeners such as Carbomer or Xanthan Gum to create gel-creams.
• Pairs well with humectants like Glycerin to offset potential dryness in cleansing formulas.
• Enhances the delivery of oil-soluble vitamins when formulated in emulsions.

Clinical Consensus & Safety

The Cosmetic Ingredient Review (CIR) Expert Panel has assessed the “Pareth” group of ingredients and concluded they are safe for use in cosmetics when formulated to be non-irritating. Research published in peer-reviewed journals indicates that these ethoxylated alcohols do not exhibit mutagenic or carcinogenic properties. Safety protocols focus heavily on purification stages to ensure that byproduct levels, such as 1,4-dioxane, remain within the strictly regulated parts-per-million limits. Dermatological testing generally shows low sensitization potential, even in leave-on applications.

Is C12-13 Pareth-23 safe for sensitive skin?

Yes, it is generally considered safe for sensitive skin when used in standard cosmetic concentrations. However, because it can enhance the penetration of other ingredients, individuals with a compromised skin barrier should ensure the rest of their product formula is free from known irritants.

Why is this ingredient used instead of natural emulsifiers?

Formulators choose this synthetic ingredient because it offers superior stability and a more refined “skin feel” than many natural alternatives. It is also less likely to undergo oxidation or color changes over time, extending the shelf life of the final product.

Does it cause acne or clogged pores?

There is no clinical evidence to suggest that this ingredient is comedogenic. It is primarily used to manage the texture and stability of a formula rather than acting as an occlusive agent that might trap sebum in the pores.