Superdrol is a designer steroid based off the parent hormone masteron, it is a di-methyl compound thus stress on the liver is much greater compared to single methyl pro-hormones. It is widely believed to be the most powerful of all pro-hormones and arguably better than D-bol at producing gains that are lean with strength increase.

Iforce has released dymethazine which was a steroid developed in the 80's it is basically two superdrol molecules separated by an ion or something (not big in chemistry) The result is a hormone that is strong, but less harsh on the liver and HPTA than superdrol.

Superdrol is sold under names such as methadrol by Iforce, m-drol by CEL, massdrol, etc. It can be found at most online supplement stroes.