This backs up the two studies on fasting glucose in diabetes and per-diabetes. It is also a higher quality study (crossover design).

I'll need to read up on why they used curcumin and resveratrol. I was also planning to use curcumin because it stimulates bile release. That may be their reason as well. They used piperine because it inhibits p450 enzymes. I'm not sure why they might have used resveratrol, though I do recall hearing that it is a bioenhancer.