ghk-cu and zinc - Research Peptide Before you start GHK-Cu, check

ACL reconstruction (rat model): Intra-articular GHK-Cu injections at 0.3-3 mg/mL transiently improved knee laxity outcomes at 6 weeks post-surgery, though improvements were not sustained at 12 weeks (PMID 25731775)

J., Griffiths, C

But some people have trouble absorbing vitamin B12 from food

The compound's selectivity extends to its membrane permeability characteristics, which allow efficient cellular uptake without affecting membrane integrity or cellular viability up to 100 M concentrations

The molecules natural decline with age is part of why it became interesting as a regenerative signal in the first place: the reasoning is that restoring a youthful signal might restore youthful tissue behavior

D., Ashburner, J., Frackowiak, R