Methyltrienolone (Methyl Trenbolone, MT, Tren Tabs, Metribolone, R1881) is a very potent, non-aromatizing androgen.(1) Methyltrienolone binds so strongly to the AR (androgen receptor) that it has been used as a photoaffinity label for the androgen receptor.(2) In other words, this stuff binds onto the AR so strongly that it is pretty much the benchmark in studies on other androgens to …