See the published research at PubMed: Pickart & Margolina, Regenerative and protective actions of GHK-Cu (PMID 29954124)
There are very little plant sources that contain Vitamin B12 apart from small amounts in some yeast products
Pancreatic proteases (trypsin, chymotrypsin, elastase) continue digestion in the duodenum
Use GHK-Cu and vitamin C in separate routines, morning versus evening, or at least 30 minutes apart
First, the components cannot be separated after reconstitution, so protocols needing an independently chosen ratio require separate vials
Moreover, researchers have reported its favorable safety profile in a 15 year follow-up study [22]