vitamin b12 injection how to give a Injection: Step-By-Step Instructions B12 Injections at Home -
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If so, you might benefit from a boost of Vitamin B-12

In the case of J2350, what's being injected is ocrelizumab, specifically a 1 mg total dosage

Diabetes Res

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