octapeptide-2 hair growth as a signal peptide, Octapeptide-2 can modulate cellular proliferation and migration, regulate cytokine release and reduce oxidative stress damage in epithelial and dermal cells. It helps maintain normal dermal cell function, supports extracellular matrix homeostasis and alleviates cell aging triggered by free radicals.
Octapeptide-2 can be incorporated into facial and body skincare formulations to deliver anti-oxidation, soothing and skin revitalising benefits. It works gently at cellular level without irritation, making it suitable for sensitive skin formulations. Manufactured via standard solid-phase peptide synthesis and refined by preparative HPLC, Octapeptide-2 undergoes full quality control including HPLC, MS, heavy metal and microbial testing. It is a versatile bioactive peptide raw material for multi-functional cosmetic formulas, not limited only to scalp and hair care applications.
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Octapeptide-2 COA
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| Certificate of Analysis | ||
| Compound name | Octapeptide-2 | |
| Grade | Pharmaceutical grade | |
| CAS No. |
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| Quantity | 12g | |
| Packaging standard | PE bag+Al foil bag | |
| Manufacturer | Shaanxi BLOOM TECH Co., Ltd | |
| Lot No. | '202601090056 | |
| MFG | Jan 9th 2026 | |
| EXP | Jan 8th 2029 | |
| Structure |
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| Item | Enterprise standard | Analysis result |
| Appearance | White or almost white powder | Conformed |
| Water content | ≤5.0% | 0.38% |
| Loss on drying | ≤1.0% | 0.28% |
| Heavy Metals | Pb≤0.5ppm | N.D. |
| As≤0.5ppm | N.D. | |
| Hg≤0.5ppm | N.D. | |
| Cd≤0.5ppm | N.D. | |
| Purity (HPLC) | ≥99.0% | 99.90% |
| Single impurity | <0.8% | 0.49% |
| Total microbial count | ≤750cfu/g | 98 |
| E. Coli | ≤2MPN/g | N.D. |
| Salmonella | N.D. | N.D. |
| Ethanol (by GC) | ≤5000ppm | 500ppm |
| Storage | Store in a sealed, dark, and dry place below -20°C | |
| N/A | ||
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Cell Migration and Proliferation Studies
octapeptide-2 hair growth is a biomimetic signal peptide that regulates cellular migration and proliferation beyond hair follicle-related cells. Multiple in vitro models, including human epidermal keratinocytes and dermal fibroblasts, were adopted to evaluate these biological behaviours.
In the scratch wound assay, different concentrations of Octapeptide-2 were applied to monolayer cell cultures. The results demonstrated that Octapeptide-2 significantly accelerated keratinocyte migration in a dose-dependent manner. It upregulates the expression of migration-associated proteins, supporting the re-epithelialisation process. Meanwhile, cell proliferation assays confirmed that Kpeptide Octapeptide-2 stimulates the viable proliferation of dermal fibroblasts. The peptide triggers intracellular signal transduction to promote cell growth without inducing abnormal over-proliferation.
These cellular activities are fundamental for epidermal tissue reconstruction. When skin barrier is compromised, the peptide helps recruit active keratinocytes and fibroblasts to the damaged area, facilitating tissue repair.
Kpeptide's repeated in-house cell tests verified stable and reproducible activity of its high-purity Octapeptide-2 batch by batch, laying solid scientific support for its application in barrier-repair skincare formulas.
Oxidative Stress Protection Research
Oxidative stress, triggered by UV irradiation, pollution and free radicals, is a major driver of skin cell senescence and tissue damage. In vitro oxidative injury models were built to assess the protective effect of Kpeptide Octapeptide-2 on dermal cells.
Human dermal fibroblasts were pre-treated with Octapeptide-2 before exposure to reactive oxygen species (ROS) inducers. Test data showed that the peptide effectively reduced intracellular ROS accumulation. It mitigated oxidative damage to cell membranes and DNA, and downregulated the expression of pro-apoptotic markers induced by oxidative insult. Octapeptide-2 helps maintain the redox balance inside skin cells. It suppresses the oxidative stress cascade that leads to premature cellular aging. This protective capacity does not rely on direct free-radical scavenging like conventional antioxidants; instead, it modulates cell survival signalling to improve the endogenous antioxidant defence of skin cells. Such findings illustrate that Kpeptide Octapeptide-2 can protect dermal cells from environmental aggressors,
reduce photoaging-related cell degeneration, and serve as a bioactive ingredient for anti-aging and skin-protective cosmetic formulations.
Skin Barrier Repair
Skin Barrier Repair: Mechanistic Deep Dive
The skin barrier, primarily constituted by the stratum corneum and the underlying viable epidermis, serves as the body's first line of defense against transepidermal water loss (TEWL), environmental irritants, pathogens, and UV-induced oxidative damage. When this barrier is compromised - due to over-cleansing, chemical exfoliation, aesthetic procedures, pollution, or chronic low-grade inflammation - the skin becomes sensitive, dehydrated, and prone to erythema and roughness. Kpeptide Octapeptide-2, as a biomimetic signal peptide, participates in multiple layers of barrier restoration by modulating epidermal cell behavior at the molecular level.
Keratinocyte Proliferation and Differentiation Balance
A healthy epidermis relies on a tightly regulated balance between basal keratinocyte proliferation and terminal differentiation toward the stratum corneum. In vitro studies using normal human epidermal keratinocytes (NHEK) have demonstrated that Kpeptide Octapeptide-2 promotes the proliferation of basal-layer keratinocytes while supporting their orderly differentiation.
The peptide upregulates the expression of differentiation markers such as involucrin, loricrin, and filaggrin - structural proteins essential for the formation of the cornified envelope. Filaggrin, in particular, is critical for barrier integrity; its breakdown products (natural moisturizing factors, NMFs) maintain stratum corneum hydration and acidic pH. By supporting filaggrin expression, Octapeptide-2 indirectly enhances the skin's natural moisturizing capacity and reduces TEWL.
Kpeptide's in-house cell assays, conducted across multiple production batches, consistently show that octapeptide-2 hair growth at optimized concentrations increases keratinocyte viability without inducing hyperproliferation or abnormal differentiation - an important safety profile distinguishing it from less selective growth-stimulating actives.
Tight Junction Integrity in the Granular Layer
Beneath the stratum corneum, tight junctions in the stratum granulosum form a second permeability barrier. Key tight junction proteins - claudin-1, occludin,
and zonula occludens-1 (ZO-1) - regulate paracellular transport and prevent uncontrolled water and solute movement. In vitro barrier models, such as reconstructed human epidermis (RHE) and Transwell-based keratinocyte monolayers, indicate that Octapeptide-2 supports the expression and localization of these tight junction proteins. Under barrier-disruption conditions (e.g., surfactant exposure or cytokine-induced inflammation), Octapeptide-2-treated groups show better preservation of transepithelial electrical resistance (TEER) - a quantitative measure of barrier tightness - compared to untreated controls. This suggests the peptide helps maintain and restore the functional integrity of the epidermal permeability barrier.
Epidermal Lipid Matrix Synthesis
The stratum corneum's "brick-and-mortar" structure depends on an extracellular lipid matrix composed of ceramides, cholesterol, and free fatty acids in a roughly equimolar ratio. Ceramides are especially critical; their depletion is associated with dryness, atopic-prone skin, and barrier dysfunction. In vitro gene expression analysis of keratinocytes treated with Octapeptide-2 shows modulation of enzymes involved in ceramide synthesis pathways,
including serine palmitoyltransferase (SPT) and glucosylceramide synthase. By supporting the production of barrier lipids, Octapeptide-2 contributes to a more cohesive, less permeable stratum corneum, reducing water loss and improving skin smoothness and softness.
Wound-Related Cellular Modulation
Cutaneous wound healing proceeds through four dynamic overlapping phases: hemostasis, inflammation, proliferation and remodeling. Kpeptide Octapeptide-2 is a cosmetic raw material and is not formulated for open wound treatment. Nevertheless, in vitro research on its wound-associated cellular responses provides scientific rationale for its application in post-procedure, barrier-compromised and sensitized skincare.
Re-Epithelialization: Accelerated Keratinocyte Migration
Re-epithelialization, the migration of keratinocytes from wound edges to cover denuded areas, is the core event of the proliferative healing stage. In scratch wound assays, a classic in vitro re-epithelialization model, confluent NHEK monolayers are mechanically scratched, and gap closure rates are monitored over 24–48 hours. Kpeptide Octapeptide-2 treatment significantly speeds up wound closure in a dose-dependent manner. Time-lapse microscopy shows the peptide enhances both migration velocity and directionality of keratinocytes moving toward the wounded gap. At the molecular level,
octapeptide-2 hair growth functions as a signal peptide binding to cell surface receptors and initiating downstream signaling cascades including PI3K/Akt and MAPK/ERK pathways. These pathways govern cell motility, cytoskeleton rearrangement and cell survival. Activated Akt promotes cell survival and migration, while ERK signaling supports proliferation; together they create a pro-reparative cellular microenvironment.
Fibroblast Activation and Extracellular Matrix Deposition
Dermal fibroblasts play a central role in proliferation and remodeling phases of wound repair. They migrate into wound beds, multiply and synthesize extracellular matrix (ECM) components such as type I & III collagen, fibronectin and hyaluronic acid to rebuild dermal structure. In vitro tests on normal human dermal fibroblasts (NHDF) show Octapeptide-2 stimulates fibroblast proliferation and migration. Gene expression analysis confirms upregulation of COL1A1, FN1 and HAS genes in peptide-treated fibroblasts.Moreover, Octapeptide-2 modulates the balance between matrix synthesis and matrix degradation. It elevates expression of tissue inhibitors of metalloproteinases (TIMPs),
which counteract excessive matrix metalloproteinase (MMP) activity. Uncontrolled high MMP levels degrade ECM and hinder healing, while insufficient remodeling causes fibrotic scarring.By regulating matrix turnover, Octapeptide-2 supports balanced dermal tissue repair.
Modulation of Growth Factors and Cytokines
Wound healing is orchestrated by an intricate network of growth factors and cytokines, including TGF-β, EGF, FGF, VEGF and PDGF. In vitro data indicates Octapeptide-2 reshapes the secretion profile of these mediators in keratinocytes and fibroblasts.
Keratinocytes treated with the peptide exhibit modulated expression of TGF-β isoforms and EGF-family ligands, which act as paracrine signals to activate underlying fibroblasts. Meanwhile, treated fibroblasts secrete more keratinocyte growth factor (KGF/FGF-7) and hepatocyte growth factor (HGF) to promote epidermal proliferation and migration. This bidirectional keratinocyte-fibroblast crosstalk is essential for coordinated tissue repair, and Octapeptide-2 enhances this cell communication.In terms of inflammation,
Octapeptide-2 exerts regulatory effects on pro-inflammatory cytokines. In vitro models with cytokine-stimulated keratinocytes (IL-1α or TNF-α challenge) demonstrate that Octapeptide-2 lowers secretion of IL-6 and IL-8, key mediators of skin inflammation and neutrophil recruitment. By mitigating excessive inflammation, the peptide helps shift the wound microenvironment from prolonged inflammatory phase toward proliferative phase, which benefits barrier recovery and calming post-procedure skin.
Signaling Support for Angiogenesis
Sufficient vascularization supplies oxygen and nutrients to repairing tissue. Although direct in vivo angiogenesis studies on Kpeptide Octapeptide-2 remain limited, in vitro modulation of VEGF in fibroblasts and keratinocytes suggests supportive effects on neovascularization signaling. VEGF is the primary driver of endothelial cell proliferation and new blood vessel formation. By adjusting VEGF expression in reparative cells, Octapeptide-2 helps build a nourished microenvironment favorable for tissue recovery. Kpeptide continues to investigate this field through internal and collaborative research programs.
Myofibroblast Differentiation and Remodeling Regulation
In the late remodeling phase, partial fibroblasts differentiate into myofibroblasts, contractile cells expressing α-smooth muscle actin (α-SMA) that drive wound contraction. Overactive or persistent myofibroblasts lead to hypertrophic scars and fibrosis. In vitro studies measuring α-SMA expression in TGF-β1-stimulated fibroblasts show octapeptide-2 hair growth can moderate myofibroblast differentiation and facilitate balanced tissue remodeling. This potential anti-fibrotic property is attractive for cosmetic applications targeting skin texture and scar appearance, though further research is still ongoing.
Transportation process
1. Pre-Shipping Packaging
The finished Octapeptide-2 powder is sealed in moisture-proof aluminum foil vacuum packaging under low-humidity conditions to avoid moisture absorption, oxidation and activity attenuation. Each package is labeled with batch number, net weight, production date and storage instructions. Outer cartons adopt shockproof and compression-resistant packaging materials to prevent extrusion and damage during long-distance transportation.
2. Transportation Environment Control
This peptide product requires dry, cool and shaded transportation environment. It avoids high temperature, direct sunlight and humid air during transit. Normal international air freight, sea freight and express delivery are all applicable. For long-duration cross-border transportation, constant low-temperature transportation is recommended to further maintain peptide activity stability.
3. Shipment Safety & Compliance
Kpeptide Octapeptide-2 is a non-toxic, non-flammable and non-hazardous cosmetic raw material. It belongs to general goods for transportation, with no special dangerous goods declaration required. All shipments comply with international shipping safety standards and cosmetic raw material transportation regulations.
4. Transit Quality Protection
Multiple shock-absorbing and buffer layers are used in packaging to reduce vibration and collision impact during loading, unloading and delivery. Complete shipping documents and batch quality certificates are attached for customs clearance and customer inspection.
5. Post-Transport Handling Suggestion
After arrival, it is recommended to store the product immediately at low temperature (-20°C) in a dry and dark environment to continuously maintain peptide purity and biological activity.
References
1.Kim JH, et al. Effects of Octapeptide-2 on human dermal papilla cell proliferation and hair growth factor expression. J Cosmet Dermatol, 2018, 17(S1):A45.
2.Tsuji Y, et al. Synthetic peptides regulating Wnt/β-catenin signaling in hair follicle stem cells. Int J Cosmet Sci, 2019, 41(S1):112.
3.Ohnishi A, et al. Protective effects of bioactive peptides against oxidative damage in dermal papilla cells. J Soc Cosmet Chem Jpn, 2020, 54(2):98-105.
Frequently Asked Questions
Q: What is the mechanism of Octapeptide-2 for skin cell migration and tissue repair?
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A: In multiple in vitro scratch wound and epidermal reconstruction models, Octapeptide-2 activates PI3K/Akt and MAPK/ERK signaling pathways, significantly promoting the migration and orderly proliferation of human epidermal keratinocytes and dermal fibroblasts. It accelerates re-epithelialization, promotes closed micro-wound repair, and improves the recovery efficiency of barrier-impaired skin caused by external irritation, cosmetic exfoliation and minor aesthetic damage.
Q: How does Octapeptide-2 repair the skin barrier at the cellular level?
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A: Octapeptide-2 strengthens skin barrier integrity through multiple regulatory pathways. It upregulates key epidermal differentiation proteins including filaggrin, involucrin and loricrin to rebuild the stratum corneum structure. It also improves the expression and stability of tight junction proteins (claudin-1, occludin, ZO-1) in the granular layer, reducing transepidermal water loss (TEWL). In addition, it modulates ceramide synthesis-related enzymes, optimizing the epidermal lipid matrix and effectively relieving dry, fragile and sensitive skin caused by barrier damage.
Q: Is the hair-regulating efficacy of Octapeptide-2 verified by in vitro experiments?
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A: Yes. In vitro studies prove that Octapeptide-2 can effectively relieve follicle atrophy caused by hormonal imbalance and oxidative stress. It rescues dormant telogen follicles, reduces continuous hair shedding, and improves hair thinning problems caused by both androgenetic alopecia and stress-induced telogen loss.
Q: Does Octapeptide-2 work for androgenetic alopecia and telogen effluvium?
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304 stainless steel meets the international requirements of food grade,316 stainless steel is not only food grade or medical grade. However,the use of this medical grade as a production cup will not bring additional benefits to everyone. Why is it called 304 or 316? This is mainly defined according to the material composition. 316 stainless steel is not similar to mineral materials,after use can release some substances to promote human absorption.
Q: Is Octapeptide-2 cytotoxic or irritating to scalp cells?
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A: In vitro cytotoxicity and skin irritation tests confirm that Octapeptide-2 has no cytotoxicity and no scalp irritation. It features excellent biocompatibility and is friendly for sensitive scalp formulas, safe for long-term topical application.
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