If I currently have higher than normal estradiol levels would a SERM (such as Enclomiphene used in E/P Protocol) selectively block only new estradiol the medication might cause or would it block some of the current extra estradiol?

It will block the new and old estradiol.

To get the most benefit from hormone optimization on the E/P Protocol (Enclomiphene), we highly recommend diet adjustment, the use of Building Blocks, and our health coaching since addressing high estrogen has to be a multi pronged approach. High estrogen can be caused by having too much adipose tissue and that has to actively be addressed. Ultimately the provider will guide you through the process.