if any final product is baked the BA breaks down in it and some even evaporates off. the acetate ester will hurt even more when the ba is baked off it irritates the muscle more.
try doing what they said and cut it also QOD has a good point is thier an expiration date on it, also was the air removed with a syringe before storage,
important always remove the air from the bottles if you are going to store them, air has bacteria in it so letting it sit in a sealed bottle with sesame oil or cottonseed oil is a food product and organic and will build bacteria on the bottle and cap BA only prevents bacteria from growing more and multiplying where BA is present, so if some was boiled off then yeah may hurt may be bad.
try this add .5 ml ba and refilter with a sterile syringe filter into a sterile vial. that should solve andy problem of sterility and as for potency tren is usually a 2 year shelf life before it starts degrading, with air in the bottle without is much longer(still sealed).