Science
Mechanism of Action
This ingredient is synthesized by hydrolyzing lemon protein and subsequently quaternizing it, resulting in a positively charged cationic polymer. This positive charge increases its affinity for the negatively charged surfaces of hair shafts and skin cells. Upon binding, it forms a protective, moisture-retaining film on the surface, which helps to prevent transepidermal water loss. Moreover, it acts as an effective humectant, actively drawing and holding moisture within cosmetic formulations and on the skin, contributing to hydration, strengthening, and film-forming benefits.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
No data suggests this ingredient is commonly used at sub-efficacious levels for marketing purposes.
The Formula
Formulation
Stability
This ingredient is designed for incorporation into the aqueous phase of formulations and exhibits temperature stability up to 50°C (122°F). Exposure to cold temperatures may alter its appearance, but its original state can be restored by gently warming the product to 45-50°C (115-122°F) and thoroughly mixing.
Safety
Safety Profile
No specific safety assessments from CIR (Cosmetic Ingredient Review) or SCCS (Scientific Committee on Consumer Safety) were identified for Hydroxypropyltrimonium Lemon Protein. The Environmental Working Group (EWG) raises concerns for the broader class of quaternary ammonium compounds, noting potential low neurotoxicity, low endocrine disruption, and low-moderate non-reproductive organ system toxicity. Consequently, this ingredient is excluded from EWG VERIFIED products.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While demonstrating promising efficacy in hair conditioning, a lack of specific clinical data for skin applications and documented safety concerns for its broader chemical class warrant caution, classifying it as having insufficient data for precision skincare.
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