Yeah I tried some panther stuff early on like 3 years ago, they were once on the board...
I didn't send it to a lab, but it was definitely underdosed if not bunk.
There are way better options out there for prohormones, or SARMs... You'd be better of finding real gear or plain Testosterone.
You can search my past posts, on this. And I am Natty now, until I get a TRT script. Since I don't profit here, new dad too, so don't ask me to PM you a source. Thanks.