As Pickart's research group documented: "GHK stimulates blood vessel and nerve outgrowth, increases collagen, elastin, and glycosaminoglycan synthesis, as well as supports the function of dermal fibroblasts" (Pickart et al., 2015)
Hair that is present may feel thicker because the shaft diameter has increased
The two principal combinations are BPC-157 plus TB-500 (mechanistically distinct, pentadecapeptide signalling plus actin sequestration), and BPC-157 plus TB-500 plus GHK-CU (three-compound research design covering pentadecapeptide, thymosin family, and copper tripeptide pathways)
Unit: Dual-chamber Snap Pen (lyophilized peptide + bacteriostatic diluent separated)
In terms of quality and purity of ingredients, there is nothing else on the market that comes close to Approved Science Glutathione
The mechanism is plausible and the anti-inflammatory rationale is real, but you would be extrapolating from non-psoriasis research