Rh-Polypeptide-3 is a biotechnological growth factor, specifically Keratinocyte Growth Factor (KGF-1), that stimulates epidermal cell renewal and strengthens the skin barrier. This protein is primarily utilized in advanced anti-aging formulations to accelerate healing and improve the overall density of the skin.
- INCI Name:
- Rh-Polypeptide-3
- Chemical/Scientific Name:
- Recombinant Human Polypeptide-3 (Keratinocyte Growth Factor-1)
- Common Aliases:
- KGF, FGF-7, sh-Polypeptide-3, Keratinocyte Growth Factor
| Category: | Active Substances |
| Source Origin: | Biotechnology (Recombinant DNA technology using E. coli or yeast) |
| Comedogenic Rating: | 0 |
| Primary Industries: | Cosmeceuticals, Regenerative Medicine, Hair Care |
| Solubility: | Water-soluble |
At a Glance: Properties & Effects
| Anti-Aging/Renewal: | |
| Barrier Repair: | |
| Soothing/Calming: | |
| Irritation Risk: |
- Primary Benefits:
- Accelerates re-epithelialization and skin repair.
- Increases epidermal thickness to combat thinning skin.
- Enhances structural integrity by promoting keratinocyte proliferation.
- Reduces the appearance of fine lines and deep wrinkles.
- Potential Risks:
- High molecular weight may limit deep penetration without delivery systems.
- Sensitivity to extreme pH levels and high temperatures.
Biological Action & Cosmetic Profile
As a member of the Fibroblast Growth Factor (FGF) family, specifically FGF-7, this signaling protein binds to the FGFR2b receptor found exclusively on epithelial cells. Unlike other growth factors that target multiple cell types, Rh-Polypeptide-3 is highly specific to keratinocytes. This specificity triggers a cascade of intracellular signaling that promotes the migration and proliferation of cells in the basal layer of the epidermis. By replenishing the cellular population, it directly addresses the thinning of the skin associated with chronological aging and environmental damage.The structural reinforcement provided by this polypeptide extends beyond simple cell turnover. Evidence suggests that Keratinocyte Growth Factor plays a vital role in the formation of the skin’s protective barrier by regulating the expression of tight junction proteins. When applied topically in stable formulations, usually alongside Aqua and Glycerin, it assists in restoring the skin’s natural defense mechanisms. This makes it particularly effective for post-procedure care, such as after chemical peels or laser treatments, where the epidermal layer has been compromised.
Broader Applications & Origins
While widely celebrated in skincare for its “youth-preserving” effects, this ingredient was originally researched for its profound wound-healing capabilities in medical contexts. In clinical settings, KGF is used to treat mucosal damage and chronic wounds due to its ability to stimulate tissue regeneration without inducing excessive scarring. In the hair care industry, the polypeptide is gaining traction for its potential to support hair follicle health, as keratinocytes are the primary building blocks of the hair shaft.
Routine Integration
- Synergies:
- Sodium Hyaluronate: Provides the hydration necessary for cellular signaling and migration.
- Panthenol: Works alongside the growth factor to soothe the skin and enhance barrier recovery.
- Collagen: Supports the structural matrix while the polypeptide focuses on cellular renewal.
- Conflicts:
- Glycolic Acid: Low pH environments can denature the protein structure of growth factors, rendering them inactive.
- Salicylic Acid: Similar to AHAs, high concentrations of BHAs may disrupt the stability of the polypeptide.
- Ascorbic Acid: Pure Vitamin C is highly acidic and should be used at a different time of day to ensure the growth factor remains effective.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) and European regulatory bodies generally recognize recombinant polypeptides as safe for topical use when produced under strict Good Manufacturing Practices (GMP). Clinical studies published in journals such as the Journal of Dermatological Science highlight its efficacy in improving skin texture and reducing transepidermal water loss (TEWL). Because it is bio-identical to the proteins naturally produced by the human body, the risk of allergic reaction or sensitization is exceptionally low, making it suitable for even the most sensitive skin types.
How long does it take to see results from Rh-Polypeptide-3?
Because growth factors work at a cellular level to stimulate new cell production, noticeable improvements in skin texture and firmness typically require 4 to 8 weeks of consistent, twice-daily application.
Can this ingredient be used after a microneedling treatment?
Yes, it is often recommended post-procedure as it significantly speeds up the healing process and supports the regeneration of the epidermal layer.
Is Rh-Polypeptide-3 vegan?
While it is “human-like” in structure, the ingredient is produced via biotechnology in a laboratory setting using microbial fermentation, meaning no human or animal tissues are used in the manufacturing process.