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Concomitant quantitative susceptibility mapping (QSM) from SN and LH was also acquired from thirty-eight PD patients and 30 age-matched healthy controls (HC)

doi: 10.1016/j.isci.2023.108741

Feb;13(1):8-12

Because your body does not readily store excess amounts, toxicity from B12 is very unlikely, even at the higher doses used in injections
