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The second comes from cognition, where tests of memory, processing speed, and executive function measure how the brain performs against age

The short, honest answer is that the injectable/systemic record is almost entirely preclinical rodent and in-vitro with no published human clinical trials of subcutaneous GHK-Cu, and everything below should be read through that lens

Our dual-peptide approach combines the collagen-boosting power of GHK-Cu with the cellular rejuvenation benefits of NAD+, creating a comprehensive anti-aging strategy that addresses multiple pathways of skin aging simultaneously

J Cutan Aesthet Surg