Your doctor may recommend taking vitamin B12, but they may also advise against taking supplements with very high concentrations of vitamin B12
Whether one is right for you depends on your goals, lifestyle, and the results youre after
Common Uses of B12 Injections B12 Deficiency Treatment Vitamin B12 injections are a standard and effective treatment for individuals experiencing deficiency, which can cause: Fatigue or weakness Anemia Tingling or numbness in hands and feet Poor concentration or memory issues Mood changes or irritability Malabsorption Conditions Some individuals cannot absorb enough B12 through diet alone due to conditions such as: Pernicious anemia Crohns disease or celiac disease Post-gastrointestinal surgery (gastric bypass, bowel resection) Chronic use of certain medications like metformin or proton pump inhibitors In these cases, B12 injections are often prescribed as a long-term solution to maintain healthy levels

It is also important to note that different conditions affect HbA1c in different ways: Haemolytic anaemia and acute blood loss shorten red cell lifespan and tend to lower HbA1c Iron deficiency anaemia is associated with increased HbA1c, likely due to prolonged red cell survival Haemoglobin variants (haemoglobinopathies) can cause variable or assay-dependent interference the effect depends on the specific variant and the HbA1c method used B12 or folate deficiency alters erythropoiesis and red cell indices, making HbA1c potentially unreliable in either direction Clinicians should therefore: Review the full blood count (FBC) alongside HbA1c Check serum B12 and folate when anaemia or macrocytosis (raised mean corpuscular volume, MCV) is identified Consider alternative glucose assessment methods specifically fasting plasma glucose or a 75 g OGTT for diagnostic purposes, or self-monitored blood glucose (SMBG) or fructosamine/glycated albumin for interim monitoring when HbA1c is unreliable Not sure where to start

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