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My needle bent or feels dull on the second try. Insulin needles dull after even one use, and bend if they hit anything firm
The only way to really know if you've taken too much vitamin B12 Apparently, there are, in fact, some things that can go wrong if you take too much vitamin B12, from a minor headache to a severe allergic reaction, depending on your own personal risk profile
At 2.4 mg/week, a 5 mg vial covers about 2 weekly doses and a 10 mg vial covers about 4, before accounting for priming losses
What should you not do after a B12 shot
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