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Aging can also set you up for a B12 shortage since absorption declines as you get older
Most people having B12 injections (intramuscular) will see an improvement in the first 24 hours, but the hematological response, including the quick production of new red blood cells, may take several days to months for a full response
Some people need a short course close together, while others may only need occasional top-ups for maintenance
They are supplied exclusively for in-vitro and pre-clinical research purposes
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