Your friend may be on a different concentration, a different formulation (B12 versus no B12), or even a different batch
It accomplishes this through several distinct mechanisms: Collagen and elastin stimulation: GHK-Cu upregulates the genes responsible for collagen I, collagen III, and elastin synthesis the structural proteins that give skin its firmness, bounce, and thickness
This study demonstrated that cultured hepatocytes treated either with a precursor of GSH, such as L-cysteine or N-acetylcysteine, or with its soluble ethyl ester form, boosts the levels of cellular GSH, which upregulates CYP27A1, CYP27B1, and VDR but downregulates CYP24A1
The chemical basis of ferroptosis
KPV is a small fragment derived from -MSH