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Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project Efficacy of different routes of vitamin B12 supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta analysis Irish Journal of Medical Science (1971 ) The Magic Red Shot Let's talk Vitamin B12 Some people need the magic red shot (AKA a B12 IM injection) instead of just taking an oral supplement. Because here's the Vitamin B12 Injections vs. Supplements: Which is Right for You?
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