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PostPosted: Fri Jan 28, 2011 8:52 pm
by bestfootforward

I realise this is an old post so you might have sorted this already, but might be lack of B12?
Metformin can lower you B12 levels, and lack of B12 can lead to flaky nails amongst other things (e.g. headaches, fatigue).
Your Dr will do a blood test for you to check it.