It starts getting delivered to the skin cells first and then from there, it transports the rest of the body through the cells
However, observational studies suggest that whilst acute toxicity remains exceptionally rare, sustained very high levels of B12particularly from supplements or injectionsmay be associated with certain health concerns, though these are correlations rather than proven causal relationships
doi: 10.2337/db07-1476 66 DushayJChuiPCGopalakrishnanGSVarela-ReyMCrawleyMFisherFMet al
Urata Y., Yamamoto H., Goto S., Tsushima H., Akazawa S., Yamashita S., Nagataki S., and Kondo T
Magnesium and calcium Why not together: Although these two minerals work together, they must be in balance to be effective