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That dual role is part of why the research base touches so many systems: skin, hair follicles, wound beds, lung, gut, and bone in animal and cell models

For instance, one aesthetic doctor might use GHK-Cu alongside antioxidants and retinoids in a skin improvement regimen

Longevity pathways activated NAD+-dependent enzymes like SIRT1, tied to DNA repair and stress response, become more active

Retesting B12 blood serum levels to verify they are increasing as expected

Compare to: High-end skincare products: $100-500 monthly Cosmetic procedures: $500-5,000+ per treatment Laser treatments: $200-1,000 per session Peptide therapy often compares favorably to other anti-aging interventions on a per-result basis