Q: Is it ok if 16 years old guy take BSN NO-XPLODE?

A: I am not a huge fan of supps in general, especially for somebody your age -- if you really decide to learn and follow a good weight training program and diet the sky is the limit for you physique-wise. There is no need for any supplements and they more often side-track people than help them because instead of optimizing diet and exercise guys tend to focus on what is the 'best' supp to take (answer: there is none -- creatine and whey protein are the only two proven supps and neither gives spectacular results all by itself). If you are absolutely set on taking supps, I would recommend plain creatine monohydrate powder over no-xplode since it is much more studied and proven and not known to pose any health dangers. NO-Xplode on the other hand is fairly new, heavily hyped, is certain to be dangerous to some people due to its nitric oxide content, and is not proven to be any more effective. It will give you better pump at the gym (again due to nitric oxide) but that is not relevant for long-term muscle and strength improvement.