sh-Polypeptide-9 is a recombinant signaling protein that functions as Vascular Endothelial Growth Factor (VEGF) to stimulate skin microcirculation and tissue repair. This biotechnology-derived peptide supports angiogenesis, enhancing the delivery of nutrients and oxygen to the dermis for improved wound healing and anti-aging benefits.
- INCI Name:
- sh-Polypeptide-9
- Chemical/Scientific Name:
- Single-chain recombinant human peptide produced by fermentation in E. coli or yeast, identical to Vascular Endothelial Growth Factor (VEGF).
- Common Aliases:
- rh-Polypeptide-9, Recombinant Human VEGF, Vascular Endothelial Growth Factor.
| Category: | Active Substances |
| Source Origin: | Biotechnology (Microbial Fermentation) |
| Comedogenic Rating: | 0 |
| Primary Industries: | Cosmeceuticals, Regenerative Medicine, Hair Care |
| Solubility: | Water-soluble |
At a Glance: Properties & Effects
| Anti-Aging/Renewal: | |
| Soothing/Calming: | |
| Barrier Repair: | |
| Irritation Risk: |
Primary Benefits:
- Accelerates the natural wound healing process by stimulating the formation of new blood vessels.
- Improves skin thickness and elasticity through the stimulation of dermal fibroblast activity.
- Enhances nutrient delivery to the hair follicles, supporting hair growth and density in scalp treatments.
- Reduces the appearance of fine lines by reinforcing the underlying structural integrity of the skin.
Potential Risks:
- High sensitivity to formulation pH and temperature, which may lead to ingredient degradation.
- Significant cost increase for the final formulation due to the complex bio-manufacturing process.
Biological Action & Cosmetic Profile
Functioning as a potent mitogen, sh-Polypeptide-9 targets endothelial cells to initiate the process of angiogenesis. This biological mechanism involves the binding of the peptide to specific receptors (VEGFR-1 and VEGFR-2) on the cell surface. Once activated, these receptors trigger a cascade of intracellular signals that promote cell proliferation, migration, and the eventual formation of organized vascular structures within the dermis.The chemical structure of this polypeptide consists of a specific sequence of amino acids that mimics the human VEGF-A protein. In the context of cosmetic science, improved vascularization ensures that the skin receives an optimized supply of oxygen and essential nutrients. This environment is critical for the synthesis of extracellular matrix proteins, including collagen and elastin, which naturally decline with chronological aging and UV exposure.Cellular signaling initiated by sh-Polypeptide-9 also plays a vital role in the inflammatory phase of skin recovery. By modulating the local environment, the peptide helps transition the skin from an inflammatory state to a proliferative state, making it a valuable inclusion in post-procedure skincare for laser or chemical peel recovery. Unlike traditional moisturizers that sit on the surface, this peptide operates at a deep structural level to restore youthful metabolic activity within the skin tissue.
Broader Applications & Origins
Synthesis of sh-Polypeptide-9 occurs via recombinant DNA technology, typically utilizing a bacterial host such as Escherichia coli. This method allows for the production of a highly purified, bio-identical protein that matches the sequence found in human physiology. Because it is bio-identical, the risk of immunological rejection or irritation is exceptionally low, distinguishing it from animal-derived growth factors used in early cosmetic iterations.Beyond facial rejuvenation, this growth factor is a cornerstone of modern hair restoration formulas. Clinical evidence suggests that increasing the vascular supply to the dermal papilla can prolong the anagen (growth) phase of the hair cycle. By maintaining a robust blood supply to the follicle, sh-Polypeptide-9 helps prevent the miniaturization of hair follicles associated with androgenetic alopecia.
Routine Integration
Synergies:
- Copper Tripeptide 1: Works alongside VEGF to maximize collagen synthesis and wound healing efficacy.
- Niacinamide: Supports the skin barrier and improves overall tone while the polypeptide handles deep tissue repair.
- Sodium Hyaluronate: Provides a hydrated environment that facilitates the transport and stability of growth factors.
- Panthenol: Enhances the soothing effects and supports the regenerative pathway.
Conflicts:
- Glycolic Acid: Low pH environments (typically below 4.0) can denature the protein structure of sh-Polypeptide-9, rendering it inactive.
- Ascorbic Acid: Highly acidic Vitamin C serums may disrupt the stability of the peptide chain if applied simultaneously.
Clinical Consensus & Safety
Dermatological assessments categorize sh-Polypeptide-9 as a safe and non-sensitizing cosmetic ingredient. While the Cosmetic Ingredient Review (CIR) continues to monitor the safety of growth factors in general, current data from SCCS and CosIng confirm its approval for topical application. Clinical studies published in journals such as the Journal of Dermatological Science highlight that topical application does not lead to systemic absorption, ensuring that its angiogenic effects remain localized to the skin’s upper layers. The purity achieved through recombinant technology further minimizes the risk of allergic reactions commonly associated with non-standardized biological extracts.
Is sh-Polypeptide-9 safe for sensitive skin?
Yes, because it is bio-identical to proteins naturally found in the body, it is generally well-tolerated by sensitive skin types. It often provides a soothing effect by accelerating the repair of a compromised skin barrier.
How should I store products containing this peptide?
Products formulated with sh-Polypeptide-9 should be kept in a cool, dark place away from direct sunlight. High temperatures can cause the peptide to lose its three-dimensional shape, which is essential for its biological activity.
Can I use this ingredient with Retinol?
Yes, these ingredients are often used together in anti-aging routines. While Retinol increases cell turnover, sh-Polypeptide-9 supports the underlying vascular health, creating a comprehensive approach to skin rejuvenation.