Keratinized tissue has an extra protective layer that makes absorption more difficult

Skin and appearance improvements Visible anti-aging effects: Improved skin elasticity and firmness Reduced fine lines and wrinkles Better skin texture and tone Faster wound healing and skin repair Hair may appear healthier, less brittle Mechanisms for skin benefits: Telomere lengthening in skin cells (keratinocytes, fibroblasts) Increased collagen production (similar to GHK-Cu ) Reduced oxidative damage from free radicals Better cellular turnover and skin renewal Improved moisture retention Timeline for visible results: Comparison to dedicated skin peptides: GHK-Cu : Stronger skin-specific effects, faster results Epithalon: Systemic anti-aging including skin, slower but comprehensive Combination approach : Epithalon + GHK-Cu = maximum skin rejuvenation Matrixyl peptides : Topical option, complementary Hair benefits: Some report thicker, healthier hair Reduced hair loss in some users Possible hair growth stimulation (anecdotal) Less dramatic than dedicated hair peptides Healthier follicles from cellular optimization Explore comprehensive anti-aging stacks at SeekPeptides

Other strengths included allowing for appropriate time following administration of anaesthetic before biomechanical and functional testing to ensure that there was no interference between measures
2019 Apr 1;16(4):1477-1488
Bioprocessing of therapeutic proteins from the inclusion bodies of Escherichia coli
KPV modulates vascular permeability and cytokine expression , providing anti-inflammatory protection and balanced tissue perfusion