can b12 injections affect kidneys vitamin damage kidneys? 5 things to know before regularly taking this supplement Can Vitamin B12 Supplements Harm
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So it is advisable to get your vitamin B12 levels tested before you start taking its supplements

Gehrig SM, van der Poel C, Hoeflich A, Naim T, Lynch GS, Metzger F
(the FDA has exempted many vitamins from formal categorization), but they are regarded as safe as part of a normal diet and necessary for fetal growth

Infantile tremor syndrome with global developmental delay and microcephaly in a 16-month-old male: A case report

So in today's world it's much safer to just get our B12 from a supplement - don't fall into the fallacy of thinking "natural" is always better
