What the primary literature consistently supports is a directional decline in GHK-related plasma activity across adult life
Spearman correlation analysis showed no association between glutathione supplementation duration and mortality ( = 0.023, p = 0.62), MELD-3 ( = +0.039, p = 0.40), or improvement status ( = 0.064, p = 0.17)
University of IowaEric Hoffman*, Janice Cook-Granroth
MacEwen, C., Sutherland, S., Daly, J., Pugh, C
Natural growth hormone output declines steadily with age, and CJC-1295 and Ipamorelin take a different path than synthetic GH: rather than replacing the hormone, they signal your own pituitary to release more of it, preserving the body's feedback-controlled, pulsatile rhythm
It does not tell you what the peptide does