10002000 g daily) can correct deficiency in some cases (even without intrinsic factor, because a small fraction can be absorbed passively)
But the dose is not always optimized for B12 repletion specifically
Because your body does not readily store excess amounts, toxicity from B12 is very unlikely, even at the higher doses used in injections
When prescribed and monitored by medical professionals, these treatments are safe and well-tolerated for many patients
It can increase your chance of having serious side effects including serious infections, cancer, serious allergic reactions, lung inflammation, and a rare condition called posterior reversible encephalopathy syndrome
Hydroxocobalamin Injections: These are sometimes recommended for refrigeration, but always check the manufacturer's instructions