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NHS approach to B12 deficiency: NICE Clinical Knowledge Summaries recommend investigating B12 deficiency in patients presenting with macrocytic anaemia, unexplained neurological symptoms, or risk factors including pernicious anaemia, gastrectomy, malabsorption disorders, metformin use, proton pump inhibitors, or nitrous oxide exposure

(There might be exceptions, such as during loading doses, and the odd person who gets more frequent injections.) Second, there is absolutely NOTHING in the legislation (which I quoted here recently) that states or implies a quantity limit

Instead of relying on oral supplements that may not absorb properly, B12 injections deliver nutrients directly into your system for better results

Any change should be agreed with the clinician or GP managing your care