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Moumoujus

PROLINE.

Valuable CAS 147-85-3 (L-) / 609-36-9 (dl-alpha) / HAIR CONDITIONING, SKIN CONDITIONING

Proline is a critical non-essential amino acid, serving as a fundamental building block for collagen and elastin, which are essential for maintaining skin's structural integrity and elasticity. It significantly contributes to the skin's Natural Moisturizing Factor, enhancing hydration and reinforcing the skin's barrier function for a visibly smoother, softer complexion.

Summary

Amino acid Skin-identical ingredient Moisturizer/Humectant Collagen/Elastin booster Antioxidant Skin barrier support Wound healing support

Science

Mechanism of Action

As a primary proteinogenic amino acid, proline is integral to the biosynthesis of dermal collagen and elastin, key proteins that uphold skin's firmness and elasticity. It acts as a vital component of the skin's Natural Moisturizing Factor (NMF), actively drawing and retaining moisture to improve hydration and strengthen the skin's protective barrier. Topically, proline can form a protective film, contributing to skin smoothness, while its antioxidant properties help neutralize free radicals, mitigating visible signs of aging and supporting wound healing processes.

Research

Clinical Evidence

High confidence
Effective range 0.1–5%
Optimal

N/A

Key findings

  1. 01 Forms of proline, such as cocoyl proline, are typically utilized in concentrations between 0.1–5% in cosmetic formulations to support skin moisture retention and structural integrity, aiming to reduce the appearance of fine lines and wrinkles.
  2. 02 A topical formulation containing L-proline demonstrated improvements in skin hydration and elasticity in human volunteers, indicating its potential to support collagen production.
  3. 03 In animal studies, L-proline administration resulted in increased collagen content and enhanced the structural integrity of the skin in mice.
  4. 04 In vitro studies on cultured human fibroblasts showed that L-proline stimulated collagen synthesis and upregulated the gene expression of collagen-related proteins.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

L-Proline exhibits high solubility in water, dissolving up to 162 g/100 mL at 25°C. Its decomposition point is approximately 220-222°C. Specific optimal pH ranges for stability in cosmetic formulations have not been identified in the available research.

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

Proline is widely recognized as a safe and well-tolerated ingredient in cosmetic applications, meeting various regulatory standards globally. Although generally safe with a low irritancy profile, a preliminary sensitivity test is recommended for individuals with highly reactive skin.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Proline is a valuable skin-identical amino acid, critically supporting collagen and elastin synthesis, enhancing skin hydration as part of the NMF, and strengthening the skin barrier with a low risk of irritation.

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