if this is your firends first cycle , he shouldnt even be running deca, it should be test only , dont realy think hes or anybody is ready for that yet because noones done their research , dont have him take anything . u need an Aromatase inhibitor (AI) for test and an Aromatase inhibitor (AI) for prolactin related issues while running that . if u dont know what that is , its better reason to stay far away until u know a little more of what u are doing , post cycle therapy (pct) would also start 3 weeks after with this , U GUYS have alot more research before u consider touching this . u are going to hurt yourselves