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Zhang W, Linden DJ (2003)

Functioning as a potent exercise mimetic, this small-molecule compound enhances mitochondrial function, fatty acid oxidation, and oxidative muscle fiber composition, thereby improving exercise endurance, cardiac metabolic efficiency, and systemic energy expenditure without increasing food intake 1-4

A separate comparative study - measuring actual collagen production via skin biopsies - found that 70% of women using GHK-Cu showed increased collagen production after one month, compared to 50% for vitamin C cream and 40% for retinoic acid cream

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[26] A complication of severe chronic PA is subacute combined degeneration of spinal cord, which leads to distal sensory loss (posterior column), absent ankle reflex, increased knee reflex response, and extensor plantar reflex response