why does a vitamin b12 injection hurt Are Shots Right for You? why do b12 injections hurt
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(PubMed) van Wijngaarden JP, Doets EL, Szczecinska A, et al

Contamination can lead to adverse effects such as headaches, dizziness, nausea, vomiting or other more serious effects depending on the contaminated substance

[5] There is essentially no risk of B-induced neuropathy at the doses used here, especially given the limited duration most patients use injectable therapy

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The B12 vitamin injections at Quintessa are completely vegan
