can b12 injections be given subcutaneously How to Give a Injection: Step-By-Step Instructions Mic B12 Injections Subcutaneous Or
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The body cannot store B12 because it is water-soluble

The most important factor is consistency of timing and route day to day, since the mechanism works cumulatively rather than as an acute event to time around a meal

If you have seen those two mixed up on forums, the source is unreliable
