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Moumoujus

HYDROXYPROLINE.

Valuable CAS 51-35-4 / ANTISTATIC, HAIR CONDITIONING, SKIN CONDITIONING, SURFACTANT - CLEANSING

Hydroxyproline is a pivotal amino acid, functioning as a primary building block of collagen to maintain skin's structural integrity and elasticity. Topically, it actively stimulates the natural synthesis of collagen and hyaluronic acid, leading to noticeable improvements in skin firmness and a reduction in the appearance of fine lines and wrinkles.

Summary

skin conditioning anti-aging firming moisturizing antioxidant hair conditioning antistatic surfactant

Science

Mechanism of Action

This key amino acid plays a crucial role in stabilizing the triple-helix structure of collagen within the skin. When applied topically, Hydroxyproline stimulates fibroblast activity, thereby inducing the natural production of both collagen and hyaluronic acid. This action leads to enhanced skin elasticity and a visible reduction in fine lines and wrinkles. It also provides antioxidant protection by neutralizing free radicals, safeguarding against oxidative damage from environmental stressors like UV radiation and pollution. Furthermore, its multiple hydroxyl groups facilitate hydrogen bonding with water, increasing moisture content in the stratum corneum, supporting skin renewal, repair, and strengthening the overall barrier function.

Research

Clinical Evidence

High confidence
Effective range 0.5–5%
Optimal

N/A

Key findings

  1. 01 Demonstrated a significant decrease in wrinkles after 8 to 12 weeks of consistent application, indicating potent anti-aging activity.
  2. 02 Frequently incorporated into high-concentration anti-aging serums, often synergistically combined with ingredients such as retinol and peptides, to effectively target specific concerns like nasolabial folds and crow's feet.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

As an amino acid derivative, Hydroxyproline can exhibit sensitivity to variations in pH, temperature, and enzymatic degradation. For more complex derivatives, such as Dipalmitoyl Hydroxyproline (an oil-soluble variant), rigorous stability testing within the emulsion's oil phase is essential to prevent hydrolysis or phase separation.

Synergies

  • retinol
  • peptides

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Low

While Hydroxyproline itself does not have a dedicated CIR safety assessment, the CIR Expert Panel has reviewed and found 'Hydrolyzed Collagen' (which is rich in hydroxyproline) safe for cosmetic use. It is generally regarded as safe and well-tolerated at typical usage levels in topical formulations, exhibiting low irritation and sensitization potential. It has also been approved in France as a component in a topical gel product (Cicactive) for superficial wounds.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Hydroxyproline is a valuable amino acid for precision skincare, fundamentally supporting collagen structure, boosting natural synthesis, and providing antioxidant benefits across all skin types with a low risk of irritation.

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