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According to a While B12 shots are necessary for some people who cannot absorb the vitamin in other ways, they have some risks and side effects
Digestive conditions like Crohn's disease and celiac disease create similar absorption problems
[20] For nutritional deficiency without intrinsic-factor loss, shorter courses-such as 30-100 mcg intramuscularly daily for five to ten days followed by 100-200 mcg monthly-are often sufficient
Furthermore, the risk of an allergic reaction is typically lower with oral supplements than with injections
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