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Giving yourself B12 injections at home is easier and more convenient than having your doctor do it every time, but doing the first injection can be a little unnerving for most folks

The injection site allows for immediate absorption into the bloodstream, providing rapid availability to cells throughout the body

Some studies suggest its hair-growth performance is comparable to 5 % minoxidil, with fewer side effects

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Maintenance doses are typically given monthly, but some people may require injections every few months

GPs can prescribe B12 injections following appropriate investigation, which should include: Full blood count to identify macrocytic anaemia Serum B12 and folate levels to confirm deficiency (using laboratory-specific reference ranges) Methylmalonic acid and/or homocysteine when B12 results are borderline Intrinsic factor antibodies if pernicious anaemia is suspected Additional tests depending on clinical presentation (e.g., thyroid function, coeliac serology) When both B12 and folate deficiency are present, B12 should be replaced before folate to avoid precipitating subacute combined degeneration of the spinal cord