Hi Anna,     Most times when people refer to supplement carriers they are referring to a handful or so and not talking about 1  or 2 lbs.   At a smaller rate all of the safe feeds should work but if your going to feed 1-2 lbs it really depends on how your horse reacts to them.. My gelding can not have that much Stabul 1 but a cup of it is fine for his supplements.--
Debbie Girard   Massachusetts  2022