His hormonal system is no where near fully developed and at 17 hes producing more natural test than he ever well any other time in his life. If hes taking those compounds he stands a real chance of messing up the easiest time in his life to gain naturally! Also could be one of the unluck people who is stuck on TRT for life and could have problems with other hormonal imbalances for life. Or need to use drugs to get a proper boner before he even learned to use it!

In short....Hes screwed... Sorry I could not resist...

On the other side...Nothing might happen...But its a coin toss and not one I personally would want to mess with.