To reach 2 mg Tesamorelin plus 200 mcg Ipamorelin per dose, first mix the Ipamorelin at 5 mg per ml. The final blended vial needs to be 5 mg per ml Tesamorelin and 0.5 mg per ml Ipamorelin. With 10 mg of Tesamorelin that requires a total volume of 2 ml, so 1 mg of Ipamorelin must be added. That means transferring 0.2 ml of the Ipamorelin solution and reconstituting the Tesamorelin with 1.8 ml of bacteriostatic water instead.
You can add Ipamorelin straight into a Tesamorelin vial to hit the target amounts with fewer injections. Both compounds are acetate salts that dissolve completely in bacteriostatic water, creating a uniform molecular solution instead of anything that settles. Constant random movement of molecules at room temperature spreads them evenly throughout the liquid until the concentration is the same everywhere, following basic diffusion principles. In a typical small vial this happens fast.