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For some individuals, vitamin B12 injections may be recommended where deficiency has been identified or absorption is impaired
Misra, M
When Vitamin B Complex Injections Are More Appropriate Vitamin B complex injections are typically used when symptoms suggest functional or relative B-vitamin insufficiency rather than a single proven deficiency
"Structures of the N-terminal modules imply large domain motions during catalysis by methionine synthase"
But injections give a much bigger dose
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