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Thank you so much, its so hard because theres no definitive way of knowing what is actually causing the fatigue - my B12, long Covid or my liver - or all three

EWAS of post-COVID-19 patients shows methylation differences in the immune-response associated gene, IFI44L, three months after COVID-19 infection

Once you achieve the desired results with a given dose, you continue taking that dose or a slightly lower one as a maintenance dose to keep the drug level steady in the body and sustain the effect over time without causing toxicity

Vital L-carnitine amino acid is essential for providing additional endurance during physical activity and it also helps to keep weight loss even progressing

There is no gold standard test that gives a clear, unequivocal answer to the question does this person have a vitamin B12 deficiency, yes or no