Some guys are even taking up to 12mg.
I think its best to start at 1mg and see how you feel. Everyone is different and personally i dont think going over 4mg is necessary.
Everyone thinks Reta is used for food suppression, that is completely incorrect, suppression is caused when dosage is too high. What you want is for Reta to block food noise while still being able to eat. Also burning of visceral fat is another one of its great featurs