Xtreme mass (new formulation) is MethylStenbolone which is very similar to Superdrol. Xtreme DMZ is Dymethazine which is also very similar to Superdrol (a little bit weaker).
Staking both is a not a great idea. First, two are methylated so it’s a lot of stress on liver. Second, both are prohormones that CAN produces major side effects. Staking both might give you side effects that will outcome the potential good effects from them.
I think it would be better to do a one good cycle of Xtreme Mass alone or Xtreme DMZ alone.