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Absorption depends on gut health, so they often work slower than injections and may not be effective for everyone
This can also help people ask questions about symptoms, medicines, diet and whether further medical advice is needed
Why Vitamin B12 Injections Are Widely Spread Vitamin B12 deficiency is one of the most common nutritional deficiencies
PMC 6470702
A low reticulocyte count can be a sign of B12 deficiency because the bone marrow cannot make red blood cells without B12
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