I never have noticed any beneficial effect of Metformin. Even after all the years of taking it, I have never known exactly what noticeable effect it is intended to have - other than diahorrea. If you do notice anything, would you put a note on here? Then I might be able to attribute something to it. Since I sometimes only have one meal, I don't always take the 2 Metformin I am meant to have. Maybe that has an effect on my, often, very high BG. Not sure.