About Dr. Perlmutter: David Perlmutter, M.D., is an expert in the human microbiome, a board-certified neurologist, Fellow of the American College of Nutrition, America’s brain-health expert and #1 New York Times best-selling author. Dr. Formulated Organic Fiber is a Certified USDA Organic source of prebiotic fiber. Available flavored or unflavored, just one tablespoon daily dissolved in water is designed to feed your beneficial gut bacteria and support a healthy microbiome.† Organic Fiber is available in a delicious organic citrus flavored fiber that is clear and packed with goodness, but is also available in unflavored. Either way, Organic Fiber is an easy and convenient way to boost your favorite beverage or food’s nutritional value with a single spoonful. Organic Fiber’s prebiotic fiber from real, organic, non-GMO whole foods helps support healthy digestion.