Yep, insulin resistance was the main reason for me looking into TRT. TRT has greatly improved my A1c (from pre-diabetes range of 6.4 in Jan of this year). I started TRT in March, my 6 weeks labs in May showed my A1c down to 6.1, then by week 13 in July my A1c had reduced down to 5.7. I added Metformin, I had labs drawn again at week 23, it doesn't appear Metformin has done much regarding my A1c, my A1c was still at 5.8 at week 23 which included 6 weeks use of Metformin. Metformin has other anti-aging properties, so at this point I think I will keep it in my regimen.