how the hell am i an amateur if i know more then u, im far from amateur in my knowledge. u want proof changing of esters is not necesary is based on the fact that all an ester does is release and slow the rate of an aas from its depot when it is injected, once in the bloodstream the enzyme responsible for ester removal takes place quite rapidly, the other reason is one of a simple understanding of aas. test prop and test cyp are both test, they will both give the same effectsx once the ester is removed.