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Forum Support in reply to As an aside, we are unsure if the fatigue is purely down to B12 deficiency or if its long covid" If your B12 deficiency is not due to diet, I'd expect GP to at least test you for PA and Coeliac disease, two autoimmune conditions that can lead to B12 deficiency

B12 injections support healthy red blood cell production, improving oxygen transport and enhancing endurance, energy, and overall vitality

Do not double the dose to catch up

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