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ghk-cu endogenous levels decline with age Are We Ready to Measure Skin Permeation of Modern Antiaging GHK–Cu Tripeptide Encapsulated in Liposomes? GHK-Cu Peptides Before and After:
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Front Neuroanat 7:3 Wang B, Chang M, Zhang R, Wo J, Wu B, Zhang H, Zhou Z, Li Z, Zhang F, Zhong C et al (2022) Spinal cord injury target-immunotherapy with TNF-alpha autoregulated and feedback-controlled human umbilical cord mesenchymal stem cell derived exosomes remodelled by CRISPR/Cas9 plasmid

Sikiri P, Petek M, Rotkvic I et al
The mitochondrial-derived peptide MOTS-c promotes metabolic homeostasis and reduces obesity and insulin resistance

Of course, people with a proper vitamin B12 deficiency will see more of a benefit, like improvement with less fatigue, nausea, and irritability
