Hi there
@HereToFloat , welcome.
I seen you post about T3, and thought I would interject here. While I cannot completely answer your question in particular. Matter of fact, no one can because they don't know your body. All of this stuff is trial by error, but after a LOT OF RESEARCH, of course, which is why you are here.
I have been taking T3 every day for the past about I think it has been 5 weeks now. (but that is not the only thing i'm taking!). I'm a female, 48 yrs young. If you want to know more about what i'm taking, look at my journal. Its all in there.
I'm taking in T3, .4ml (from a 1ml oral syringe) at night I mix it with a little water and drink it.
I am dropping body fat, but then again my diet is SPOT ON, and i'm in a deficit. I weight lift about 6 days a week and doing 60 mins of cardio everyday.
Yes, T3 can be catabolic, but if you are ok with that then so be it. I have managed to keep my lean muscle thus far...i get bodyfat tested every couple of weeks, this is how I know and use as my gauge. I was at 17% bf when i started (136lbs), last Sat i am now at 14%. I weight 132lbs right now.
There is nothing in the compound to indicate that you cannot also have your preworkout. I personally don't do preworkout, i drink 2 cups a coffee a day and that is it for caffeine for me.
But my goal is to put on lean muscle and lose body fat at the same time. Very tough and probably quite different than what your goal is. I just wanted to give you an example.
I will also add, that before I started taking T3, I was losing bodyfat quite well eating at a deficit and getting a cheat meal/refeed about every 5 weeks or so. Then a carb up meal in between.
Whatever road you take, there you are.....
Happy Lifting...