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The intramuscular method is chosen for its effectiveness in delivering the dose directly into the muscle
18 Table 4 Time to Improvement of Abnormalities in Vitamin B12 Deficiency After Initiation of Treatment A 2005 Cochrane review involving 108 patients with vitamin B 12 deficiency found that high-dose oral replacement (1 mg to 2 mg per day) was as effective as parenteral administration for correcting anemia and neurologic symptoms
CL Answer The suggested daily serving for my fish oil supplement, three 1,000 mg softgels, seems like a lot
PMCID: PMC9775659.
doi:10.1056/NEJMoa2206038
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