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And, critically for this discussion, it slows gastric emptying, the rate at which food moves from your stomach into your small intestine
Therefore, high serum B12 levels in individuals supplementing with B12 are typically harmless and do not cause adverse health effects
If the vitamin is administered by injection in response to a deficiency and enters the bloodstream directly in high concentrations, an immunologic reaction with skin reactions is possible
The dose administered is dependent on the condition and can be tailored in frequency and amount based on the patients response
No adverse or toxic events have been reported in healthy people who get too much B12 from food or supplements
