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The responsible first step in either case is testing, not guessing
Injections are prescribed by a doctor and given intramuscularly or into the muscle
Vitamin B12 is important for the growth and development of red blood cells
100% Systemic Bioavailability: Oral B12 supplements are notoriously difficult for the body to absorb due to the reliance on intrinsic factor in the gut
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Some patients feel as though they want more frequent injections, and occasionally we test levels to see if they are receiving adequate replacement, but Im not sure how strong the evidence is to support this. GPs should consider periodic vitamin B12 testing of higher-risk patients who take metformin, even if they dont display symptoms of deficiency, the UK medicines regulator said earlier this year
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