This is done by a lot of guys but personally I wouldn't do it. Just test at 150mg a week or so is good for cruise. Really want to get off everything during that time to give your body a break. Its not like that 100mg of tren is going to do all that much for you. I'm cruising now on 150mg test cyp and 3.33iu of GH a day. Soon I'm going to drop the test to 100mg a week and add 200mg a week of primo.