It's been known for some time that serious wounds can heal more quickly when insulin is applied. I found some old papers on this dating back to 1970!
Now there's some research showing how insulin can be combined with nanodiamonds (these are smaller than microdiamonds) to make it easier to deliver the insulin to the right place.
More, including a nanodiamond picture on my post about insulin, wounds and microdiamonds
Have you tried using insulin on a wound? How has that worked for you?