Vitamin B12 (Cobalamin) for Nerve Function

Research suggests that the available published evidence linking vitamin B12 directly to nerve function is limited within this particular set of studies, which consists of a prenatal supplementation trial examining gene expression in newborn cord blood and a genetics database cataloging variants associated with B12 status. The prenatal trial found that a B12-containing multi-micronutrient intervention influenced gene activity related to cell division in newborns, though the researchers caution that long-term follow-up is needed to understand any meaningful health outcomes, and the findings cannot be cleanly attributed to B12 alone. The genetics database study identifies several genes, including TCN2, which is involved in B12 transport, as associated with circulating B12 levels, pointing toward individual variation in how people process the vitamin. Neither study directly addresses nerve function as an outcome, so while B12's role in neurological health is a recognized area of broader scientific inquiry, these particular studies do not provide direct evidence on that relationship and readers interested in that question would need to consult a wider body of literature.