not present in plants Daily requirement: ~ 23 g/day Body stores: 25 mg , mostly in the liver (sufficient for 25 years) Absorption Pathway : In the mouth/stomach: B12 is protein-bound in food Stomach acid and pepsin release B12 from food proteins B12 binds to haptocorrin (also called R-binder or transcobalamin I) secreted by salivary glands and gastric mucosa In the small intestine : In the duodenum , pancreatic proteases degrade haptocorrin Free B12 then binds to intrinsic factor (IF) , a glycoprotein secreted by gastric parietal cells The B12IF complex travels to the terminal ileum , where it binds to cubilin receptors and is absorbed via receptor-mediated endocytosis 1 In the enterocyte and bloodstream: Inside enterocytes, B12 dissociates from IF It binds to transcobalamin II (TCII) for systemic transport Only B12TCII complex (called holotranscobalamin ) is biologically active and taken up by tissues Storage and transport: B12 is stored in the liver (main site), but also in muscle Transcobalamin II transports active B12 to tissues

Studies have observed decreased cyclooxygenase-2 (COX-2) gene expression, reduced myeloperoxidase activity, and lower levels of pro-inflammatory cytokines including interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-)
IV therapy delivers 2-6 times higher doses directly to liver tissue, potentially providing even greater benefits
Several favorable voters focused on the market that already exists: patients buying research-use-only vials from anonymous or lightly accountable sellers
On the day of the assay, serial dilutions (7-fold dilutions, 7 concentrations per compound and one well containing only assay buffer) of test compounds were performed in duplicate in assay buffer to appropriate concentrations in 96-well plates (Greiner, U-shape #GR-650201) using a Biomek i7 liquid handler
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