L-Pyroglutamic Acid (PCA) or Pyrrolidone Carboxylic Acid (PCA) is commonly used as a moisturizing agent in skincare formulations. Specifically, its sodium salt (Sodium PCA) is frequently cited for topical benefits. Here's a summary of well-documented topical benefits with supporting research citations:

Topical Benefits of PCA:

1. Hydration and Moisturization
   • PCA acts as a natural moisturizing factor (NMF), significantly enhancing skin hydration by attracting and retaining moisture from the environment.
   • Sodium PCA has high water-binding capabilities, helping restore and maintain the skin's hydration barrier.

Scientific Evidence:

• Humectant Activity:
  • Sodium PCA increases the water-holding capacity of the stratum corneum, significantly improving skin hydration (Warner et al., 2003).
• Barrier Function Improvement:
  • PCA derivatives have been demonstrated to enhance the structural integrity of the skin barrier, which is vital for preventing transepidermal water loss (Rawlings & Harding, 2004).
• Skin Smoothing and Softening:
  • Topical application of formulations containing PCA leads to improved skin texture and smoothness, confirmed by clinical studies (Lodén, 2003).
• Protection Against Irritation:
  • PCA may help reduce irritation and inflammation associated with topical treatments by improving the skin’s hydration level and barrier integrity (Fluhr et al., 2001).
• Enhanced Skin Elasticity:
  • Sodium PCA has shown efficacy in maintaining or improving skin elasticity, which can support anti-aging effects (Wickett & Visscher, 2006).

Common Applications:

• Moisturizing creams, serums, and lotions.
• Anti-aging formulations.
• Barrier creams to alleviate dryness and prevent irritation.
• Sensitive skin preparations.

How to use: For all types of cosmetics, available in gel, serum, lotion or cream form.

Mixing method: Mix directly into the formula in water (water phase).

Usage rate: 0.1-3%

Product characteristics: Solid powder

Solubility: Can be dissolved in water immediately.

Storage: For long-term storage, keep in the refrigerator, avoid sunlight and heat. Shelf life is at least 2 years.

INCI Name : PCA