1. Description
Chemical Properties: Ahk cu is a hexapeptide-copper complex. Its core structure consists of an acetylated hexapeptide sequence (containing multiple histidine residues) forming a stable coordination complex with Cu²⁺, with the imidazole ring of histidine serving as the central coordination site. Chemically stable, it resists dissociation within a pH range of 5.0–7.5 and exhibits significantly superior resistance to peptidase hydrolysis compared to free peptides. It demonstrates excellent compatibility with common cosmetic ingredients such as vitamin C, ceramides, and hyaluronic acid, carries no risk of oxidative discoloration, and its complex structure protects copper ions from reduction.
Physical Properties: Ahk cu appears as a white to light blue-gray crystalline powder at room temperature, odorless and tasteless. It exhibits excellent water solubility (solubility ≥100 mg/mL), dissolving rapidly in aqueous systems like pure water and physiological saline. It is slightly soluble in ethanol and propylene glycol, but insoluble in non-polar solvents such as ether and petroleum ether. Store at 2-8°C in a dry, sealed container protected from light. Avoid exposure to high temperatures (>40°C) and strong reducing agents. Cosmetic-grade product purity ≥98% (HPLC detection), copper ion complexation rate ≥95%.
Source and Preparation: Ahk Cu has no natural occurrence and is synthesized via a two-step process: “solid-phase synthesis + complexation purification.” High-purity L-amino acids are first synthesized into acetylhexapeptide-1, which undergoes complexation with copper sulfate/chloride under neutral conditions. Free peptides and uncomplexed copper ions are subsequently removed via dialysis and column chromatography purification, ensuring structural uniformity and biological activity of the final product.
2. Application
Premium Skincare Category (Core Applications): As a key ingredient in anti-aging and repair skincare products, Ahk cu is widely incorporated into serums, anti-aging creams, eye serums, repair lotions, and similar formulations. Suitable for early-aging skin (ages 25-35), mature skin (ages 35+), and barrier-compromised skin (sensitive, dry-sensitive skin). Can be used alone or synergistically blended with peptides, hyaluronic acid, retinol, etc., making it an ideal ingredient for premium skincare brands' dual-action “anti-aging + repair” products.
Hair Care Applications: Ahk cu is incorporated into scalp serums, anti-hair loss shampoos, and hair growth tonics. Targeting individuals experiencing androgenetic alopecia, stress-induced hair loss, or postpartum hair shedding, it activates the microenvironment of hair follicles to prevent hair loss and strengthen strands. This makes it suitable for functional product development within premium hair care brands.
Biomedical Research & Aesthetic Repair: Ahk cu serves as a research tool in skin damage repair mechanisms, used in cellular models (fibroblasts, hair follicle cells) and animal models (skin-injured mice, hair-loss mice). It can also be incorporated into post-aesthetic treatment repair products (e.g., post-photorejuvenation or microneedling repair creams/serums) to alleviate post-procedure redness and accelerate barrier restoration.
3. Main Efficacy
Skin Anti-Aging and Structural Repair Benefits: The core mechanism of AHK-Cu is to activate the collagen synthesis pathway in skin fibroblasts, promoting the production of Type I and Type III collagen as well as elastin. Simultaneously, it repairs the dermal-epidermal junction (DEJ) structure and increases dermal thickness. In human skin tests, continuous application of 0.05% AHK-Cu for 28 days reduced fine lines by 18.3% and improved elasticity by 22.5%, significantly addressing aging concerns like skin laxity and dry lines.
Follicle Activation and Hair Care Benefits: AHK-Cu targets hair matrix cells in follicles, upregulating expression of growth-related genes (e.g., VEGF, IGF-1) to convert telogen follicles into anagen phase, prolonging the hair growth cycle. simultaneously improves the follicular microenvironment, enhances hair anchoring within the follicle, and reduces breakage and shedding. Continuous use for 8 weeks increases hair density by 9.7% and hair shaft diameter by 7.2%.
Antioxidant and Anti-inflammatory Soothing Effects: Chelated copper ions serve as the core cofactor for superoxide dismutase (SOD), significantly boosting SOD activity within the skin. This efficiently scavenges reactive oxygen species (ROS), reducing oxidative stress damage to skin cells. Simultaneously, it inhibits the release of inflammatory mediators like TNF-α and IL-6, alleviating skin redness and sensitivity. When used post-aesthetic procedures, it reduces redness resolution time by over 30%.
Safety Advantages: Ahk cu exhibits no cytotoxicity (MTT assay shows >95% cell viability at concentrations ≤1 mg/mL) and no sensitization potential (negative HRIPT test). It is suitable for sensitive skin, pregnant women, and other special skin types. Its high transdermal absorption efficiency (acetylation modification increases transdermal penetration rate to over 40%) enables direct delivery to the dermis for effective action.
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