Contents Summary Given that many otherwise healthy vegans develop B12 deficiency when not supplementing their diets with B12, intestinal bacteria cannot be relied upon to prevent B12 deficiency in vegans. Are raw foodists or people who eat fermented foods exceptions? No. See the section B12 Status of Raw Foodist Vegans. Bacteria in the Large Intestine … Continue reading Intestinal Bacteria as a Vitamin B12 Source