PKU express coolers are by far the best!!!! i love them, they are easy to cary around, (a bit bulky compaired to other formuas) but they are super quick and easy. i know that seems right out of a magizine, but they really are worth a try, at first they taste kinda gross, but after taking them for a week the taste becomes unoticable. i have been taking the PKU coolers for about a year and a half. i love them! out of all the different amino acid formats, they are by far the best!