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This is one reason many advanced hair serums now include both GHK-Cu and AHK-Cu rather than relying on a single peptide alone

[Abstract]2025 Jun 3;97(21):11099-11109

Diabetes 64 , 344352 (2015)

Research has shown that the net effect of combining the three peptides results in increased GH secretion and IGF-1 levels, increased muscle growth, increased bone density, improved cognitive function and memory, increased cellular repair and regeneration, increased fat loss, and more

Immunohorizons 6 , 476487 (2022)

The supplements glutathione, vitamin C and peptide-rich formula works synergistically to stimulate collagen production, improve skin elasticity and reduce fine lines and wrinkles