there was A LOT on the pro muscle forum about it, with studies and a doctor that came in discussing it in detail. google test and tren cruise pro muscle or something
A 'study' on pro muscle...

I'm talking about research papers, accepted by relevant medical journals, not random PDFs, anyone can make a PDF, LOL
To start with, tren has an androgenic score of
500%, only methyl compounds, halo & dimethyltrienolone have higher scores.