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Vitamin B12 is found naturally almost exclusively in animal-derived foods, as it is synthesised by microorganisms in the gastrointestinal tracts of animals

Structure Therapeutics and others are pursuing oral GIP/GLP-1 dual agonists, but these programs are at much earlier stages of development

B12 and folate work as a pair to build healthy red blood cells, and a shortage of either can cause similar tiredness and large red cells

However, by this point, you will be deficient in the money you have spent on needless injections, so Save Face recommend a full check-up with either your NHS GP or a private doctor, who can confirm your symptoms and any genuine deficiency with a blood test, and more importantly can prescribe the best type of B12 product and treatment programme to suit your needs.