Hi Kiran,
I think it's great that you decided to do a bit of research and ask around before taking supplements. Don't get me wrong, supplements are very important for an athlete, as excessive exercise often results in a weakened immune system and vitamin deficiency, plus you want to increase your strength and endurance. I don't really know anything about NO Shut Gun, but I can personally recommend you aceformula (aceformula.com); it's safe, non-addictive, so you don't have to worry abut side effects and it's a vegetarian product (you mentioned you were a vegetarian). Also, coffee is a great natural energy booster, try not to overdo it though or you might end up with sleep disorders.
Hope this helped!
Leah