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You may be able to bring the full syringe to your pharmacy so they can replace it
Trends Cancer 10:430443
Birkner E 1 , Zalejska-Fiolka J, Kasperczyk A, Kasperczyk S, Grucka-Mamczar E, Stawiarska-Pieta B, Birkner K
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If you have a temporary deficiency or increased requirement (say, after a surgery or during recovery from an acute illness), you might only need a short course, perhaps a few weeks of injections, until your vitamin levels normalize or you can meet your needs by mouth again
