The small intestinal epithelium is composed of villi that extend into the lumen and are lined by differentiated, post-mitotic cell types, and the crypts of Lieberkhn that contain Paneth cells and undifferentiated stem cells [16]
Goey KKH, Elias SG, Hinke A, Oijen MGH, Punt CJA, Hegewisch-Becker S, et al
This controlled copper transport serves as cofactor for critical enzymes including: Lysyl oxidase: Essential for collagen and elastin cross-linking Lysyl hydroxylase: Required for proper collagen synthesis Superoxide dismutase: Provides antioxidant defense mechanisms Cytochrome c oxidase: Powers cellular respiration Tyrosinase: Facilitates melanin production The peptide can readily obtain Cu from plasma albumin, functioning bidirectionally to transport copper into or out of cells based on cellular requirements
Fortunately, you cannot overdose on vitamin B12, as it is water-soluble, so adding more is not harmful