The present invention describes a formulation comprising a prune and/or plum concentrate, and one or more water-soluble, non-digestible, prebiotic oligosaccharides. Optionally, one or more low calorie sweeteners, an antioxidant, calcium sennosides, or sennosides extract, PEG-3350, licorice, cocoa, coffee, tea flavors; fruit flavorings and spice flavorings, gelatin, agar-agar, carrageenan, pectin or cocoa powder are added. Other ingredients may be present as dietary supplements such as water-soluble vitamins, lipid-soluble vitamins; amino acids, maltodextrin, resveratrol, caffeine, mineral supplements, or natural sleep aids for use as a laxative, A variety of formulations are possible, such as premix, a laxative+energy power drink or power bar, or as a prebiotic supplement in probiotic yogurts, or in the form of gummies, chocolates, candies, and desserts such as red beans Japanese desserts. These present formulations are improved for taste, fast acting, portable and palatable laxatives, and as dietary supplements.