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Vitamin B12 levels are usually tested with a blood serum test, and values below approximately 170250 picogram per milliliter in adults are considered signs of deficiencies

The report covers an in depth analysis of 40+ countries

Liu G., Yu Z., Gao L., et al., Erythrocytic Alphasynuclein in Early Parkinson's Disease: A 3year Longitudinal Study, Parkinsonism & Related Disorders 104 (2022): 4448

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Roddam AW, Allen NE, Appleby P, Key TJ, Ferrucci L, Carter HB, et al
