When should you drink prune juice? If you're having a problem with regular bowel movements, experts say, prune juice may be the solution you're looking for. Start your day with a glass of Jolly Fresh 100% Prune Juice that is made from dried plums or prunes from California because it contains essential nutrients, antioxidants and fiber. A hydrator that’s made of 100% prune juice, you’re guaranteed that it’s a natural health booster and a rich source of energy. It is a great addition to your diet too as it is rich in fiber and fat-free.