hospira brand bac water Bacteriostatic - 30ML Bottle Natural rubber latex has not been used in the manufacture of this device or drug container closure system Package 1 Vial / 10 m Injections: Bacteriostatic Water for Injection,
Description
It depends on your current weekly dose

However, this may not be the best route if you lack intrinsic factor

Measure bi-weekly using the same technique each time

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You'll be fine