Two years ago I started to get tired and breathless. I put it down to getting older (I'm 83)
Eventually went to doctor, had blood tests, and found my B12 levels were very low.
Had a course of 6 injection over two weeks, and now have a single top up every 3 months,. Felt better ever since.
Cannot take tablets as I cannot absorb the stuff orally.
I also take iron to raise my red cell count as well, as that was also lowish.
Definitely do not change unless doctor authorizes as your sister maybe another case where absorption orally is a problem.
As a footnote.
If tablet form is recommended, always take B12 tablets and iron on an empty stomach for best results.
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