glutathione in human plasma decline in association with aging age-related Erythrocyte (GSH) plotted as a function of age Frontiers | Glutathione deficiency in
Description
Vitamin B12 injections help by directly delivering the nutrient into the bloodstream, bypassing absorption issues and quickly restoring optimal levels to improve energy, mood, and overall health
doi: 10.5144/0256-4947.2014.107
Cell Metab 30, 630655.Google Scholar Lu, Y, Yang, J, Wu, Q et al
Wu KE, Fazal FM, Parker KR, et al
So what you're describing very well matches with that
