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It is possible to buy a private vitamin B12 self-test, which will either be in the form of bloods being taken by a professional or as finger-prick blood sample to do yourself via post

Your doctor will assess the potential benefits and risks before prescribing Key B12 PFS 1500 mcg Injection 1 ml

[11] Pernicious anemia can be treated with injections of vitamin B 12

Even if a person is not deficient in Vitamin B12, as defined by a blood test, the symptoms of a B12 deficiency may include: Feeling weak or tired Problems with vision Headaches Pins and needles Reduced mental functions Wish to check you vitamin B12 levels