Pomegranate Lychee. Energy to replenish... More Info mental alertness during the marathon of a busy day. Vuka Think is a lightly carbonated pomegranate and lychee drink focused on improving your memory and concentration. Contains natural caffeine, ginkgo biloba, panax ginseng, and dmae bitartrate as well as B3, B5, B6, B12 and grape seed extract. 90 calories per serving, 2 servings per bottle. 16 fl oz.