So, if your vitamin B12 deficiency is due to an autoimmune disease in which your stomach doesn't make intrinsic factor, supplements might not work for you, and you will need injections

Angiogenic Pathway Activation Multi-Component Blood Vessel Formation Multiple components contribute to comprehensive angiogenesis through distinct but complementary mechanisms[5]: BPC-157 upregulates VEGFR2 expression and enhances endothelial cell proliferation TB-500 promotes endothelial cell migration and tube formation GHK-Cu stimulates angiogenic growth factor expression and vessel maturation Combined effects result in robust tissue vascularization and nutrient delivery Improved collateral circulation development in ischemic conditions Nitric Oxide System Modulation Vascular Protection BPC-157 influences nitric oxide signaling pathways to support vascular function[6]: Enhanced eNOS phosphorylation leading to controlled NO production Modulation of blood flow and vascular tone Protection against both NO excess and NO deficiency states Coordination with angiogenic effects for comprehensive vascular support Synergistic Advantage: KLOW Blends four-pathway approach enables simultaneous activation of cellular migration (BPC-157/TB-500), matrix synthesis and gene expression modulation (GHK-Cu), robust inflammation control (KPV), and comprehensive angiogenesis

doi:10.1074/jbc.M706204200 Massudi H, Grant R, Braidy N, Guest J, Farnsworth B, Guillemin GJ
It can help fix B12 deficiencies that cause pain, supporting nerve health
No official human dosing standard exists, so doses should be set with a physician
Handle in accordance with standard laboratory safety procedures