hi i am currently 23 years old asian and been gymming on and off due to time constraints.

my weakness is in my chest. is there any tips to kick start the growth of my chest? cos my arms is seriously oversized compared to my puny chest. please help?

secondly, i recently got hold of a product named tribulus and it claimed that it can increase muscle growth, or rather a natural steriods, can anyone share some light in this tribulus thingy? i've yet to try and i dun know about its side effects, cant really take all these kind of stuff as i'm currently in the military and i'm afraid i might get caught for it.