From low energy and stubborn fat that doesnt seem to budge, to difficulties with blood sugar balance or frustration with diets that dont last, these challenges can impact confidence, health, and overall quality of life
Vitamin B12 Injection After Gastric Surgery or Gastrointestinal Illness Gastric surgery and gastrointestinal illnesses impair intrinsic factor and stomach acid production, both necessary for oral vitamin B12 absorption
For many individuals, diet and oral supplementation are sufficient
Then the highest dose of oral B12 the NHS would prescribe is 1mg cyancobalamin a day & someone with pernicious anaemia would at best absorb about 1% of that via passive diffusion although it would be interesting to know what effect 100 mg oral B12 would have and I think there is a obvious conflict of interest for GPs to free up nurses than to ask questions like this or properly get feedback from their patents bmj.com/content/365/bmj.l18

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While research agrees that every human needs it, the different forms and how the body puts it to use means that its not always simple to make sure you are getting what you need