I have 5g of Formestane in NP Penetrate from about 1 1/2 years ago. I shake the bottle every week or two. The bottle has been kept in a cool dark place. Is it still good? I worry a little about the alcohol and the plastic bottle - is it possible some of the plastic could dissolve into the solution? I don't want to use it if it is potentially contaminated with plastic since it has been stored for so long.
But if still good then I'm definitely using it, especially since it is hard to come by.