nac vs glutathione supplements or Glutathione: Which Supplement Works Best in 2026? – Cellular Prime NAC vs. Glutathione: Which One
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In fact, one study found that treating seven B12-deficient people with oral methylcobalamin normalized vitamin B12 levels in their blood within just 2 months

[DOI] [PubMed] [Google Scholar] 66.Ichijo H., Nishida E., Irie K., ten Dijke P., Saitoh M., Moriguchi T., Takagi M., Matsumoto K., Miyazono K., Gotoh Y

Evans, A., Jamieson, S

PLoS ONE 6:e0025482

If there is a scatter plot, I think that another variable that should be considered is the type of B12 injected
