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It is contraindicated in patients with severe cardiovascular disease, uncontrolled hypertension, and in those with severe neurological disorders
Ideally, blood tests (including full blood count, serum B12, folate, and possibly anti-intrinsic factor antibodies if pernicious anaemia is suspected) should be performed before starting supplements, as supplementation can affect test results
Prescription Vitamin B12 Injections: Tiaminal and Other Formulations Tiaminal and other Vitamin B12 injection formulas give doctors many choices for treating B12 deficiency
An injection skips all of that and gets the vitamin straight into your bloodstream