b12 injection time frame Vitamin Dosage Are B12 Shots Safe? Royal

Riboflavin status varies widely across the globe, with low- and middle-income countries at highest risk of deficiency

Also, patients should be warned about the danger of taking folic acid in place of Vitamin B12, because the former may prevent anemia but allow progression of subacute combined degeneration

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Other risk groups include older adults, pregnant women, people taking metformin or long-term acid-suppressing medications (PPIs, H2 blockers), those with conditions affecting the gastrointestinal tract (pernicious anaemia, Crohn's disease, coeliac disease), and individuals who have undergone gastric or ileal surgery