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B12 injections are generally very safe
At a medical spa setting, injections are given under professional supervision, which adds an extra layer of reassurance
No changes in cancer markers, hormones, liver, or kidney function reported (only monitored in the short term days)
Increase of 2,3-epoxybutane mutagenicity by glutathione-S-transferases [PMID: 6377584] Laboratory literature summary: Increase of 2,3-epoxybutane mutagenicity by glutathione-S-transferases
The stomach is a harsh, acidic environment designed to break down proteins
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