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B12 supplements are often used to treat or prevent deficiency, which can lead to symptoms such as fatigue, weakness, constipation, loss of appetite, and megaloblastic anemia
You can always transition to IM later if needed
Acute injuries often improved faster, while chronic degenerative conditions usually required longer timelines
July 2016a
A systematic review and meta-analysis
Missing lab results Claims fail when iron tests or hemoglobin results are missing
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