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Food Sources for B12 The body does not make B12, therefore, you must get it through animal-based foods or from supplements

The profound, debilitating fatigue experienced in ME/CFS and Long COVID is fundamentally different from normal tiredness

10.1038/s41596-018-0119-1 61

Prices also vary considerably once you calculate what each milligram actually costs
Santos, T., Hennetier, L., Costa, V