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Conversely, a few studies reported high levels of vitamin B12 in the blood of patients with a worse COVID-19 outcome 48,49 potentially due to cytolysis leading to the release of intracellular B12 into the plasma and disrupted B12 clearance by the liver, which is often affected in these patients 50

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The full dose goes directly into your bloodstream

Critical role of Astrocyte NAD(+) Glycohydrolase in myelin injury and regeneration

In other words, the vitamin appears alongside the disease but does not necessarily trigger it

Spence JD, Howard VJ, Chambless LE, Malinow MR, Pettigrew LC, Stampfer M, Toole JF