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Search for how to inject B12 into fat and you find a lot of at-home how-to guides
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Rodent studies show systemic effects from oral dosing, implying mucosal absorption, but nasal spray is a distinct route with different epithelial barriers
similarly, potent CYP3A4 inhibitors could raise serum testosterone concentrations, whereas 5-alpha-reductase inhibitors counteract androgenic activity, highlighting the importance of comprehensive medication reconciliation at each visit
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