You don't use a high enough dose to be suppressive (200 mg. tapered to 100 mg per day after two weeks), but enough to combat the high cortisol levels you'll experience during PCT.
A lot of guys use
DHEA in PCT nowadays and it tends to make things go much smoother. Dr. D is a
big proponent of this and he definitely knows a lot about hormones, suppression, etc. and gives solid advice.