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Message: <blockquote data-quote="Oldvatr" data-source="post: 2396654" data-attributes="member: 196898">Yes I am iron deficient anemic, but my B12 is fine.  My doc has prescribed an iron tablet and a folate tablet daily.  The iron tab turns my poop black which was a bit disconcerting,  Since you have this result, you can ask to be tested for B12.  Not all doctors know about the metformin link to B12 deficiency since it is a long-term effect.I do not think this is in the BNF or patient info.  It is mainly the FDA in the US that is flagging this as a problem, NICE do not necessarily follow the FDA warnings.Here is the science study from the US,<a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6867725/" target="_blank">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6867725/</a>It does get a small mention in the BNF as a rare or very rare effect<a href="https://bnf.nice.org.uk/drug/metformin-hydrochloride.html" target="_blank">https://bnf.nice.org.uk/drug/metformin-hydrochloride.html</a></blockquote>

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