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Nutrient Deficiencies and Lab Results Low levels of B12, B6, or other B vitamins might warrant an initial round of weekly or biweekly injections until levels stabilize
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This helps them decide if you need B12 shots and how much
Blood tests, like serum B12 levels and complete blood counts, are key to making these decisions
If you think youre low on B12, talk with your doc.
Vitamin B12 injections begin working at a cellular level almost immediately after administration, though the timeframe for noticeable symptom improvement varies considerably between individuals
