how long after b12 injection blood test initiating vitamin (cobalamin) injections should lab work be rechecked for a patient with an initial vitamin B12 level of 173, which is below the normal range? How Long Does It Take

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This is especially helpful for people who have a problem with digestive issues or cannot absorb B12 through food

22 May 2026 6 min Why do I feel worse after my B12 injection

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