This is another precursor nutrient the body needs in order to make glutathione
From there, the active ingredients get absorbed rapidly into the bloodstream
It is a tri-peptide and cannot be damaged by the digestion process
The resulting GSH or homoglutathione (-L-glutamyl-L-cysteinyl--alanine) conjugates were usually much less toxic and more water-soluble than the original xenobiotics (Brown and Neighbors, 1) (Bartling et al., 2002
So, if you're feeling unwell due to a deficiency, restoring B12 levels might help you feel well enough to eat normally, but it's not "making" you gain weight in an unhealthy way
Moreover, mice with systemic knockout of SLC25A39 (including the heart) exhibited severe anemia, a complete lack of red blood cells, and iron overload [62]