Dietary Supplement. For Carb Conscious Dieters.™ Customized Formulas for the Carb Conscious Dieter. All Natural Sugar & Carb Blocking Formula. Exclusively with Phaseolin EX™. Carb Up Your Favorite Snacks with Carb Block! Now you can enjoy your favorite carb-rich foods and snacks without the worry. Just two tablets of the Doctor s LowCarbDiet™ Carb Block will help prevent up to 38 grams of sugars and carbs from being absorbed by your body. Carb Black contains the proprietary ingredient, Phaseolin EX™, a highly purified herbal extract which is rich in phaseolamin. Phaseolamin in.