Finaflex stack

Hello guys, i recently was looking into purhasing the finaflex prohormone stack that includes 1 andro and 550xd. Ive been reading a lot and users have complained of lower sex drive and sometimes complete shutdown. Is there anything to prevent this? The guy at supplement shop says only
If you abuse it will it happen. I know to take pct after but what about during? Im totally terrified of this because u know..my girlfriend and all lol. Any help would be appreciated!

Btw im 25, 215 lbs and 6'0. Been working out for 5 years

Prohormones will screw you up.

Don't your time, energy and more importantly, your money.