As such, you should always PCT after using it. Now whilst we've used the word 'suppressive' a lot; you need to remember that SARMs are nowhere in the same league as anabolic steroids when it comes suppressing natural testosterone production. Most of the time, it is slight and can be rectified with PCT. However, they are not completely innocent either' Taken in high dosages, they can cause all of the following: 1 ' SARMs will suppress your natural testosterone production ' it is unavoidable, mk 677 how to use. During one study conducted on behalf of GTx Inc.Gain Lean Muscle ' If you were to combine the above mentioned effects into one, you'd realize that Ostabulk makes for a phenomenal SARM to use for lean bulks, mk 677 how to use.