Science
Mechanism of Action
Caprolactam functions by momentarily reorganizing the lipid architecture of the stratum corneum, allowing for deeper penetration of both hydrophilic and lipophilic actives. Additionally, when integrated into polymer structures like Nylon-6, it creates a smoothing antistatic film that stabilizes the skin’s microenvironment and prevents moisture loss.
Research
Clinical Evidence
Medium confidence1%
Key findings
- 01 In vitro porcine skin models indicate that caprolactam-derived ionic liquids significantly outperform traditional penetration enhancers (like Azone) at concentrations between 10-15%.
- 02 Safety evaluations confirm that residual monomer levels below 1% in cosmetic polymers are non-sensitizing and effective for maintaining film integrity without irritation.
Transparency
Dusting Analysis
Because caprolactam is often present only as a residual byproduct of polymer manufacturing (like Nylon-6) rather than a deliberate active, it is frequently 'dusted' in ingredient lists at negligible levels that provide no real penetration enhancement.
The Formula
Formulation
Stability
Highly hygroscopic and stable in neutral environments; however, it is prone to hydrolysis into 6-aminohexanoic acid if exposed to strong mineral acids.
Synergies
- Hydrophilic actives
- Film-forming polymers
- Nylon-6
Conflicts
- Strong mineral acids
- Strong oxidizing agents
- Strong bases
Safety
Safety Profile
Safe for cosmetic use when restricted to levels under 1% within polymer complexes. Pure, standalone caprolactam is a known skin irritant and is restricted in high-concentration topical applications.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A specialized penetration enhancer and film precursor that is valuable for texture and delivery, provided it is formulated within strict safety thresholds.
Related
Similar Ingredients
Finding similar ingredients…