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Vitamin B12 injections are typically prescribed for people who have a deficiency and cannot absorb the vitamin through food or oral supplements
Using the same injection site twice in a row or multiple times can cause discomfort or damage to the skin
Your provider will recommend a schedule that fits your goals and tracks progress over time
PMC 3650358
28 days is the FDA requirement for producers of multi-use vials to prove their bacteriostatic maintains efficacy
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