ghk-cu plasma levels age decline 200 ng/ml to 80 ng/ml vs AHK-Cu: Which Copper Peptide Is More Effective? Does GHK-Cu Really Work? 40

Participants included healthy subjects that were between the ages of 21 and 61 years old, and they received single and repeated doses of CJC-1295 over the course of several weeks

Despite promising data, TA1 remains experimental for autoimmune conditions

Laboratory studies show GHK-Cu treatment results in enhanced capillary-like tube formation in three-dimensional culture systems, with treated endothelial cells forming more extensive networks with improved branch points and connectivity compared to untreated controls, indicating promotion of both early vessel sprouting and later network organization phases

PMID 11304860

Some B12 supplements may also include aluminum, which is more likely to build up in the body when someone has kidney disease