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Neuroscience Letters 472, 4752 (2010)

We showed that ferroptosis-related antioxidant pathways are dominant in NB tumors with poor prognosis

1997;52(3):M129M136

So injecting beyond a certain point may cause your cells to fight off the excess B12 so hard that it might reduce the amount of active cellular B12 - probably not to dangerous levels, but possibly sufficient to trigger some symptoms

Sphingosine 1-phosphate receptor 1 promotes B cell localization in the splenic marginal zone
