This is a pretty good article that addresses both early phase 1 and 2 human studies and the carcinogenic effects that came to light during the animal studies.
The animal studies were 2-3 years at length and extremely high doses compared to the average human trials of 3 months at 10 mgs.
I ran it before I was diagnosed with cancer last year and was unimpressed. I certainly don’t attribute it to the diagnosis I ended up with, however I certainly wouldn’t run it again because frankly I was unimpressed and it’s not worth the risk/reward ratio in my book. The juice wasn’t worth the squeeze...
My .2
Here’s the link (scroll to the bottom for the objective portions of the studies)
https://moreplatesmoredates.com/cardarine-overview/