Although I am sure stupid questions have been asked else where I thought it appropriate to get a thread going. I'll lead with my first stupid question:

So, I'm looking at vials of different esters of test, and being the paranoid guy I am, I wonder, how can one truly know the product is free of bacteria or other biological contamination? Is heating it in boiling water out of the question? At any rate, any info on the matter or a link containing as much would be great.