Science
Mechanism of Action
As an ethoxylated diol and PEG derivative, PEG-15 Butanediol functions by forming hydrogen bonds with water molecules, effectively binding and retaining moisture within the stratum corneum to deliver long-term hydration. This humectant action also supports the skin's barrier function, thereby mitigating transepidermal water loss. Beyond hydration, it acts as a solvent for other cosmetic ingredients and can enhance the penetration of active compounds, making it a multifaceted component in topical preparations. It also exhibits properties as a surfactant, emulsifier, cleansing agent, and skin conditioner.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
There is no specific data available regarding the 'dusting' potential or thresholds for PEG-15 Butanediol.
The Formula
Formulation
Stability
PEG-15 Butanediol is highly soluble in water and various polar solvents, ensuring ease of integration into aqueous formulations. While its aqueous solutions maintain stability at room temperature, the ingredient is susceptible to oxidative degradation when exposed to air. Factors such as elevated temperatures, light exposure, and oxygen presence can accelerate this degradation, leading to undesirable changes like increased aldehyde and carboxylate levels, altered ionic strength, and pH reduction. Optimal stability is achieved through refrigeration (4°C) or freezing (-20°C), minimizing oxygen exposure (e.g., argon purging), and light protection.
Conflicts
- Phenol (potential reduction of antimicrobial action)
- Penicillin (rapid inactivation)
- Bacitracin (rapid inactivation)
- Sorbitol
- Tannic acid
- Salicylic acid
- Certain plastics (potential impact on integrity)
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) has deemed PEG compounds, including PEG-15 Butanediol, 'relatively safe for use in cosmetics under the present conditions of intended use'. Studies indicate low acute oral and dermal toxicity, with minimal irritation on intact human skin and no observed sensitization. However, it's important to note that sensitization and nephrotoxicity have been reported in burn patients when treated with PEG-based creams. The Environmental Working Group (EWG) assigns a 'LOW' concern rating for cancer, allergies, immunotoxicity, and reproductive/developmental toxicity, though this rating increases for inhalable product forms or if contaminants like ethylene oxide and 1,4-dioxane are present. The FDA has approved PEG-15 Butanediol for certain food uses, and it is crucial to differentiate this ingredient from 1,4-butanediol, which carries an FDA Class I Health Hazard warning for non-medical oral ingestion due to its conversion to GHB, a risk entirely unrelated to cosmetic application.
Your Skin
Skin Compatibility
Our Assessment
Verdict
PEG-15 Butanediol is a valuable multi-functional ingredient offering effective hydration, solvent properties, and formulation stability, suitable for a wide range of skin types with a favorable safety profile.
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