Starbucks decided to use Phoenix for their new cold beverage called "Refreshers' this summer. There is Cool Lime and Very Berry. I understand they are made with "green coffee" coffee that has not bee roasted, which results in slightly higher caffeine content per cup.
All I can say is the Cool Lime Refresher has gotten me through these 110 degree days. I love it! I can't tell any difference in the caffeine content, no shakes, stomach aches, etc. All I know is the cool lime-mint flavor is delicious and well...refreshing!
Hope it goes national soon, so you all can try it!