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I'm sure everyone here knows - but just to clarify -

The people who need the injections have a problen with absobtion - basically their bodies defense mechanism attacks the substance needed to...

Now pericious anaemia is due to an inability to absorb B12 rather than a dietry deficiency- it does have a genetic element in tis aetiology (people who have it are also more prone to get Diabetes 1,...

I've never actually heard of anyone having a dietry B12 deficiency - it must be incredably rare - certainly in the UK.