Requirements of vitamin B 12 in excess of normal (due to pregnancy, thyrotoxicosis, hemolytic anemia, hemorrhage, malignancy, hepatic and renal disease) can usually be met with oral supplementation
Eligible studies included randomised controlled trials, cohort, and case-control studies assessing B12 supplementation efficacy via oral, sublingual, or IM administration routes
Recent updates could meaningfully change eligibility and costs
Marcia US 1 review Aug 7, 2025 It was simple, easy, and the communication is great
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