slc25a39 is necessary for mitochondrial glutathione import in mammalian cells and function mitochondrial glutathione Autoregulatory control of mitochondrial glutathione
Description
Both can raise B12 levels effectively, but they behave differently once injected

How many shots do you need

[DOI] [PMC free article] [PubMed] [Google Scholar] 8.Ormstad K., Jones D.P., Orrenius S

This is the "reduced" or activated form of ALA
