If I remember correctly, ppl use to say when epistane goes bad it actually breaks down into a different hormone, still works. I don't remember how much truth there is to that. Does it have a sulfur smell? Because that was what everyone said happened when it went expired.
Put epistane aside for a min, when it comes to oral steroids in general they are usually good pretty much forever. I know someone who used dbol that was like 40 years old or something along those lines. Still worked