An improved formulation of probiotics, which consist of prebiotics, probiotics and metabolites that maintains or improves gastrointestinal and immune health and is more stable and effective than original probiotics comprises a mixture of prebiotics and probiotics in the ratio of 4:1 to 8:1, metabolites and probiotics in a ratio of 1:1 to 1:20 and optionally with other excipients. The synergistic combination can be used in various types of food and presented in tablet, capsule and sachet forms. Consumers can also take it on its own, or added into drinks for their convenience.