I'm thinking about stacking again. I tried it in early 2023 without much success but I was using chinese tirz and reta.
I have some official zepbound that I got over the past year when my insurance covered but I was trying to only take reta, so I just stored it to take later. Plus I had been on chinese vendor tirz I had been on for like a year in 2022, while it worked great, I also developed severe adhedonia and just general malaise. So I'm a little hesitant to rely on zepb alone.
However, I also had some benefits on Tirz that I never had on reta which is mainly it seemed to cure my anemia.