A friend of mine is saying they are stacking Jack3D with 1000mg's of Niacin. I am wondering if anyone else has tried this, or would say it's a bad idea. I actually have prescription Niacin from a year ago before I started working out for high triglycerides.

Not something I would do tomorrow, as I just started taking the Jack two days ago. I really do love the product if anyone is reading and hasn't tried it. Gave me very good focus, my muscle recovery time between sets was phenomenal, and I felt very energized.