I was diagnosed 15 months ago, but started on metformin in January of this year. Commenced with one tablet, now it's 2. A few days ago I noticed with a start how thin my hair has become. When I used to bunch it into a ponytail it was quite substantial, now the pony tail is very slender. The internet confirms that some people do experience thinning of hair, others dont. Apparently the package leaflet used to include this side effect but at some stage dropped it. However, I spoke to Bristol Labs today and they went thru all their package inserts for metformin going back to 2008 and cannot find a reference to thinning hair at all. Anyone experience thinning? Does it slow down or stop at some stage?