It helped me greatly, around the end of Oct. 2011 I had a blood test done and my blood glucose was a 270. I was about to be put on sugar meds but, my doc gave me 3 months to fix it with diet and exercise. By January I was able to get my fasting blood glucose down to 97 on my blood test so just barely within normal range, I hadn't started testosterone replacement therapy (TRT) yet so on avg. it was in that range before testosterone replacement therapy (TRT) but, of course during the day after eating it could get high 120's, 140's depending on what I ate.
In February 2012 I started testosterone replacement therapy (TRT), now my fasting blood glucose can be anywhere in the 60's and 80's. I don't really even check it regularly anymore. The other day I checked my blood glucose 1-2 hr after every meal from fasting, it was 66 at fasting and even after eating food (I even had subway / bread) that day it didn't go past 113.
So, I'm definitely seeing improvements in my blood glucose after starting testosterone replacement therapy (TRT), I wonder what my A1C will be like. Back in January (before TRT) it was a 6.4 so still higher than normal range. I'll probably get another test done next month.