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The following comparison summarizes the key considerations: For patients with intact GI absorption, oral high-dose supplementation (1,000 to 2,000 mcg daily) provides a convenient and cost-effective path to correcting deficiency
Gastrointestinal issues: If youve been diagnosed with gastrointestinal disorders such as celiac disease or Crohns disease, or youve undergone gastrointestinal surgery, you may require B12 injections
Food and Drug Administration (2024) 2
unregulated and alone is the single biggest safety factor in the whole conversation
doi:10.1038/nchembio.1204
US$ 22.48
US$ 20.19
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US$ 25.18
US$ 24.53
US$ 23.06
