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Phase 2 Carb ControllerDietary SupplementSource Naturals Carbohydrate Blocker contains Phase 2Ⓡ white kidney bean extract. Phase 2Ⓡ works by slowing down the digestion of starch by inhibiting alpha-amylase an enzyme that breaks down starch to be more fully absorbed by the body. Carbohydrate blocker may help support weight loss when used in conjunction with the Maximum Metabolism Weight Loss Plan™ (included).