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Other factors include: Underlying cause of deficiency : Pernicious anaemia, malabsorption disorders, or dietary insufficiency may affect treatment response Medication use : Metformin and proton pump inhibitors can reduce gastrointestinal B12 absorption (though this does not affect the efficacy of intramuscular injections) Individual variation : Differences in how efficiently your body utilises the injected vitamin Adherence to treatment schedule : Missing injections or delaying maintenance doses can slow recovery Discussing these factors with your healthcare provider helps set realistic expectations for your treatment journey
4 Both MMA and homocysteine levels will accumulate in the body during B12 deficiency and just homocysteine is elevated for folate deficiency
In a 2018 review, researchers found evidence that taking 1,000 mcg of B12 and getting B12 injections had similar effects on treating B12 deficiencies
There's really no ideal injection site
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