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I'd say 50% reduction so quickly is very commendable.
Stay with your diet, and the other things and you may see more reduction.
I'd suggest you switch to newer better version of alpha lipoic acid.
Here is a thread to explain why:
Some people have beginning impaired glucose utilization and this supplement can help with that in addition to helping the PN itself. So getting both actions with one thing is worth switching.
If you want to use up what you have to take it on an empty stomach and take at least 600mg a day.
R-lipoic is not in stores yet that I have seen. Esp the stabilized form which is much better absorbed.
iherb.com has it... at discounted prices. 100mg a day to start.
Also Amazon carries it too now.
Doctor's Best R-lipoic stabilized...be sure you get the correct type, as there are other R-lipoics out there that are not. (I was using one of those inferior ones by mistake myself!).
It takes a while on the GF diet to get substantial results. But since you already feel better, I'd stick with it indefinitely.
Impaired glucose tolerance does not show up on the common tests for diabetes. Only the long 4-5hr glucose tolerance test, which is not often done. So you could have impaired functions without really being high on the less complex screening types.
So it would be good to watch your sugar intake, and starchy carbs...and have lean protein, veggies, fruit and good fats in your meals. Some of the gluten free substitutes are high in sugar and starches, so watch your labels if you buy them.
There is a good brown rice pasta by Tinkyada, which is actually lower in glycemic risk than regular wheat pasta and tastes almost the same. Try to find that if you can.
I did gluten free for 3 yrs, and found Tinkyada very good (actually the best GF pasta out there).
While you are here, please take a look at the Subforum where we have many threads and posts of interest.