SERM's are used after a AAS cycle to help recover your hpta as part of a PCT. in plain english. it helps get your nuts producing testosterone after being shutdown after a cycle. i use clomid at 12-25mg ED immediately after i get test clearance. for more info head over to the AAS or PCT sections of the site.
if you are natural you need not worry about SERM's as natural supps such as unleashed do not suppress the HPTA.