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Assessment of folate, homocysteine and vitamin B12 basal levels The standard chemiluminescence method was used by a commercial clinical laboratory (Geraldo Lustosa, Belo Horizonte, Brazil) to quantify the basal levels of folate (vitamin B9), homocysteine (HCY), and vitamin B12 in plasma samples from all volunteers

It is not approved for human use

Bidirectional association between diabetic peripheral neuropathy and vitamin B12 deficiency: two longitudinal 9-year follow-up studies using a national sample cohort

That said, although side effects from vitamin B12 supplementation are very rare, it can possibly occur with B12 injections, but not with oral supplements