i read a post that masteron is similar to proviron - can it be used instead of proviron?
No masteron and proviron are not the same things...... Mast will harden you up and is a steroid . Proviron is an anti-e but does have the ability to harden muscles but no where near the same effect as mast.
I personally don't worry too much about expiration date on most orals. To your point, they could be less potent, but probably not un-safe.
Give it a shot, it (probably) won't hurt you.
So far so good, they seem to be doing what they’re supposed to.
Expired dbol (blue hearts)