All of the juice in Langers Prune is concentrated juice. with two fruit servings and a daily value of 120% for vitamin C. Nothing artificial, no sweeteners or sugar added. Why is prune juice used instead of plum juice? Since the juice is taken from dried plums rather than fresh plums, the term "prune juice" is used instead of "plum juice." Pruning juice differs from plum juice in that it modifies the fruit's texture, flavor, and nutritional makeup.