Many advanced users stack several compounds in order to get maximum results from their cycle. Normally when your stacking these types of supplements its best to use single compounds instead of premixed stacks. The problem with using a premixed stack is you may get more of one compound than you want. Most of these products have sweet spots. Lets use h-drol for an example according to many of the forums out there 75mg is the sweet spot for this compound. Now lets say you have a halodrol product that is mixed with 10mg of Methylstenbolone. In order to get the proper amound of hdrol you will get more than the recommended dose of M-sten.
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.