Anyone heard/tried G-Mass?

My buddy bought some stuff at GNC called G-Mass and said it works pretty good. Supposedly you take four tablets before you go to bed and it doubles your original testosterone amount.
Is this stuff any good?

Do you mean Z-mass? If so, it's ZMA. Feedback is conflicting on ZMA, some people love it, some people think it's a waste of money. I tend to lean toward the latter, as with most supplements...

LOL, yeah it's Z-Mass. I was going on a whole day without sleep and it showed.

Thanks for the input. For $20, I'll give it a try.