Couldnt swear
against it, but Ive not heard it helps control bg per se.
If it did , we would all be on it.
I know in terms of supplements that chromium is supposed to help with it.
When I was first diagnosed someone mentioned this to me as being good as helping bg. Made me laugh (as a T1) as of course, only thing going to help me is insulin
I know that Benfotiamine (vit b derived) is often used by those with complications relating to neuropathy but whether it helps otherwise, I couldnt say
I do know that those on metformin can become deplete in vit b (B12?) so if you are on Metformin maybe this is what he means.