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 Enzymes Organic Digest + is the first and only USDA Certified Organic and non-GMO delicious chewable vegan enzyme. Dr. Perlmutter formulated Organic Digest + to be the first and only full-spectrum digestive enzyme formula that includes organic whole foods and is Non-GMO Project Verified. In fact Organic Digest + contains 29 powdered Certified USDA Organic fruits and vegetables combined with a select blend of powerful digestive enzymes.