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why do vitamin b12 injections hurt I feel worse after a injection? Best Vitamin B12 Injection Site:
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B12 shot schedule: loading and maintenance Protocols vary by country and scenario

(PubMed) Zhou F, Chen S

Colchicine, para-aminosalicylic acid, and heavy alcohol intake for longer than 2 weeks may produce malabsorption of vitamin B12
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While these typically subside within a few days, you should always notify your doctor just in case, Wirtz says
