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 ) Is intramuscular (IM) vitamin B12 more effective than oral vitamin B12 supplements, such as 10,000 micrograms (mcg) over the counter (OTC)? B12 Injections vs. Oral Supplements: Which Works Better? Systematic Review and Pragmatic Clinical Approach to Oral and Nasal Vitamin B12 (Cobalamin) Treatment in Patients with Vitamin B12 Deficiency Related to Gastrointestinal Disorders
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injectable b12 vs oral Methylcobalamin Injection 1500 mcg