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Neural Regeneration Research , 17 (3), 482482
Products with 1-2% GHK-Cu concentration in stable formulations with appropriate pH and penetration enhancers create stronger improvements more likely persisting after treatment, while lower concentrations (0.1-0.5%) or degraded products may produce subtle temporary effects disappearing quickly upon discontinuation
2003 Nov;36(8):585-90
The fourth is the over-reading of expression profiling already noted, compounded by the age-related decline claim, which is repeated with a confidence that the primary measurements do not support
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