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The liver can store the vitamin for a long time, so it may take a few years for deficiency and symptoms to develop

[4] However, consistently taking large amounts of vitamins from multiple sources could potentially increase the risk of side effects (for example, very high vitamin B intake from multiple supplements over time can cause neuropathy, and high niacin from many sources could affect your liver)

Next, the team performed cultured cell assays to determine the SARS-CoV-2 inhibitory capabilities of the compounds

What this means for you is that it will take some element of trial and error to really figure out how much B12 you should be taking

(5) Stier H, Vos E, Kenley D, Safety and Tolerability of the Hexadecapeptide AOD9604 in Humans