Under normal conditions to gain muscle you need to EAT MORE calories than you use.
To burn fat you need to EAT LESS calories than you use,so you tap into the reserves stored as fat .
N.O.-Xplode has only 25 cals per serve.
Hydroxycut Hardcore is a fat burner that has no calories.
So together they should work in synergy to promote fat utilization.
If you are young and have plenty of natural growth factors you should be able to gain lean mass while utilizing fat as an energy source,but you will need to have your numbers right on {diet cals} which I dought you can accomplish.
Most people just bulk up by eating slightly in excess of caloric requirement consistently.
Then cut up,by eating a slight caloric deficit consistently.
It is such a fine balance to burn fat and gain muscle at the same time.
To do so would require god gifted genetics and a perfect daily diet regime or a vast array of perscription supplements and a perfect daily diet regime