that my gear is real?

i have a vial of 20ml Stan 50 (Stanazol) in other words, winnie, but where can I find out if this stuff is good?

and what are the procedures? do i send them 1cc or what? and if it is legit, i plan on using it next year around Feb., by puncturing the vial, will it still be sterile 8months from now?

once again, thanks for the help!