Cyp/Enth blend safe on blood levels?

as said many times, i realize that cyp and enth are very similar in structure, however, a close friend of mine (a scientist working for nike ) swears that this type of test blend would be hell trying to keep blood levels steady. well of course i told him to handle his polymers and leave the gear to me. i wasn't asking his opinion, simply told him of plans for a cycle and he had some input. hopefully some of you bro's that have experience with this blend could help me out with some enlightening info

ST54