There are a lot of conflicting articles floating around online that either suggest that SARMs are completely anabolic substances and carry with them no androgenic properties, or on the flip side that they can completely shut down your natural testosterone production. Neither of which are completely true.
The truth is, although SARMs have do have a high binding affinity to the androgen receptor, the androgen properties of SARMs compounds are so minimal they are almost negligible. Even the most anabolic compounds, such as RAD-140 Testolone, has less than one tenth the androgenic properties of testosterone.
Below you can see which SARMs are most suppressive compared to others.
Mildly Suppressive SARMs:
Very Suppressive SARMs:
YK-11 (Myostatin Inhibitor)
It is always a good idea to have a PCT on hand in case you do feel suppressed following your cycle, and you can find ours, which is a very powerful product here
Other (Not Suppressive and Not SARMs):
There is an array of accurate information in the SARMs book. You can find that here