This is a common misconception. You're not the first and you're certainly not the last one to have this misguided opinion.
First, rat, or any other rodent or small animal dosages, DO NOT linearly translate to human dosages.
This is how you translate rodent to human dosages:
View: https://www.reddit.com/r/NicotinamideRiboside/comments/4jf3gz/converting_mouse_dosages_to_human_equivalent/
Secondly, we've discussed this here on meso plenty of times. You can view one of our discussions here:
Longest safe time on cardarine / gw501516
I've been taking cardarine/gw501516 at 10mg for 8 weeks. I find it gives good endurance boost and think of continuing. Is it safe to be on it for long periods? How long have you run it?thinksteroids.com
Type put it very eloquently in that thread so there is no need for me to re-explain or add anything of more value to the discussion, so I'll just quote his reply:
Cardarine is cancerogenic, there really is no discussion here. Will you get cancer from it? Or will you get cancer somewhere down the line, from what you planted with cardarine use way back in the day? Not a question I'd want to empirically have answered on my self and I wouldn't recommend it to others either. There are plenty of safer ways to loose body fat, no need to experiment with some experimental, dubious compounds.
Thanks for providing this, and you’ve brought some threads to my attention that I wasn’t aware of. This doesn’t however directly address the proclivity for tumour development that rodents have in comparison to humans
Secondly the point was raised regarding accelerated tumour growth but that’s not carcinogenic otherwise GH/MK677 etc would also be carcinogenic. Rather they can accelerate growth in pre existing tumours