If you are prone to estrogen sensitivity, I would start with 12.5 mg ED and see how you respond. Within a few wks, the test will build up and within this process, you will need to watch yourself closely. Watch for sides and if you feel anything, go to 25mg ED. With an off season cycle, you want to take enough to regulate estrogen while still making gains. We don't want you to be overly dry. You may want to have some caber on hand in case you are also sensitive to prolactin. Between the 2, you should be able to control any problem that comes up