Shouldn't be suppressive to my knowledge, it's for lowering cortisol. But I've heard it's not very effective. Maybe it was due to poor bioavailability, not sure. What are you looking to use it for?
For cortisol control I believe transdermal b-aet would be better. You can find it from brands called Iconic Formulations, Apex Alchemy, Iron Legion, XPG. Or for oral cortisol control supp look up SNS Reduce XT (7-alpha-hydroxy-dhea + 7-beta-hydroxy-dhea).