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[DOI] [PMC free article] [PubMed] [Google Scholar] 232.Liochev SI

The brain substantia nigra in PD has a high level of expression of the VD metabolizing enzyme and 1 hydroxylase, and VD can stimulate the expression of tyrosine hydroxylase, a key enzyme of dopamine synthesis in PD, which affects the production and turnover of dopamine, therefore, the role of VD in the development process of PD has received increasing attention (85, 86)

Severe or prolonged B12 deficiency can lead to a range of neurological manifestations, including peripheral neuropathy, which may present as pain, paraesthesia (pins and needles), or altered sensation in the extremities

Christen S, Lorendeau D, Schmieder R, Broekaert D, Metzger K, Veys K, Elia I, Buescher JM, Orth MF, Davidson SM, Grnewald TG, De Bock K, Fendt SM