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Tap water contains minerals, chlorine, and microbesall of which are disastrous for a sensitive research compound
Lung Cancer In 2017, a study found that men taking B12 supplements appeared to have an increase in lung cancer risk
A review of 12 available trials found a median sample size of just 48 participants and noted that eight of the twelve studies were funded by clinics selling the injections a significant source of bias
Reported or proposed issue Long-term or repeated-cycle effects Evidence source No long-term human trial Known or theoretical
Sitting on any drugstore shelf, they cost little and require no appointment to pick up
Serious adverse events are not reported in the literature
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