Some medications prevent the absorption of B12 and if you are vegetarian or vegan, then maintaining enough B12 through your diet is not possible
Yes, copper peptides, particularly GHK-Cu, can reduce DHTs impact on hair follicles by inhibiting 5-alpha reductase, the enzyme responsible for converting testosterone into DHT
Zhang Y, Huo MR, Zhou JP, Zou AF, Li WZ, Yao CL, et al
Heffernan et al., The Effects of Human GH and Its Lipolytic Fragment (AOD9604) on Lipid Metabolism Following Chronic Treatment in Obese Mice and 3-AR Knock-Out Mice, Endocrinology, vol
(Gene array data on decorin and collagen upregulation in human fibroblast cultures at nanomolar to low micromolar concentrations, cited broadly in GHK-Cu literature.) Maquart FX, Pickart L, Laurent M, et al
In fact, because glutamine is a precursor to glutathione, they often work in harmony