what sweed says is right..i gained 7kgs on my var and tbol cycle..lost 4 kgs in pct..no doubt by 6th week i was feeling on top of this world but after pct i realised it could have been better ..i also got loads of stomach ailments..at your age you can gain much more naturally because your test is at its best..later on when test starts dropping you could go for a test first cycle but not without properly educating yourself with the pros and cons..