Many things? If you know the purity and the math is right then what are some of those "many" things?Then not “everything is tested” as you claim. Many things can cause a batch to come out underdosed even if you know the purity. If it’s that easy why does ANYONE do finished oil testing? It sounds like you are just making excuses and not recognizing it could be underdosed because you have no hplc testing on test e recently. Way to accept responsibility