I didn't stack with Tirz, only with Reta, but Tesamorelin every night before bed (1 month at 1mg because I'm still paying Canadian resale prices of $150 per 20mg vial.) I recently upped it to 2mg nightly because I thought I was plateauing, but a recent scan shows favourable results, so I might drop it back down to 1mg.
It's magical! I've slacked on my training this month yet still look jacked; the definition is visible, and there's zero fluid retention, even with my 10g creatine and 2 LMNT packets daily. A recent DEXA reveals I'm up 6.6% in muscle mass, and down 6.9% in fat mass since starting Jan 7. I am eating 1 to 1.5 grams of protein per lb of body weight though, so that definitely plays a role.
Other faves so far have been Reta, SS-31, & Epitalon.
My meh? Copper. My body does not do the blue.