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Factors such as initial B12 levels, underlying medical conditions, certain medications, advanced age, and injection frequency can affect the absorption and utilization of B12, possibly shortening the duration of action
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When To Take High-Dose Vitamin B12 Supplements Treating Vitamin B12 Deficiency People take high-dose vitamin B12 to treat a vitamin deficiency (levels below 200 to 250 pg/mL)
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