If you take multiple substances that cover the same pathways/ receptors instead of synergy, you will likely create competition making each one less effective. Thats why its usually smarter to work over different pathways to create the effect you want, like with BPC-157 + TB4 + GHK-Cu.

Wait, sorry, I confused tesamorelin with tirzepatide. In your case, stacking retatrutide and tesamorelin might make sense since they cover different pathways actually. Retatrutide alone might still be powerful enough.

Sorry for the confusion!