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However, it is important to note that not all B12 supplements are the same
If you see any air bubbles, lightly tap or flick the syringe to draw the bubbles to the top (the end with the needle) and expel the air
Many nutrients have their action INSIDE the cell, which means that testing serum and blood levels just give us an indication of what may be available but that is assuming everything else is working properly: cellular activity, enzyme activity, receptor activity, etc
This is the reason Vitamin B12 injections are thought to be far more efficient
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