THIS!!!!
Also, splitting Clen dosage into 2 or even 3 administrations will decrease the feeling of heart overstimulation. Say you got up to 120 mcg. You would be better served taking 60mcg twice a day or even 3x40mcg than all 120 at once.
Fwiw, I get good results at 50-80mcg daily. You don’t necessarily need as much as some people just want to take.