injectable b12 vs oral when to switch from vitamin to Can I start intramuscular therapy and later supplementation? Oral vs. Intramuscular Vitamin B12 – Vitamin B12 Injections Vs Oral

People taking medications that interfere with B12 absorption, including metformin or long-term acid-reducing medications, often benefit from injections

These two delaying factors are why patients with low B12 levels are often prescribed B12 shots instead of oral supplements

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Thus all of the DNA synthetic effects of B 12 deficiency, including the megaloblastic anemia of pernicious anemia, resolve if sufficient dietary folate is present

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