Citric Acid: Vegan, Gluten-Free, GMO Question

Despite the name, almost all commercial citric acid is not squeezed from citrus; it is produced by fermenting a sugar with the mold Aspergillus niger. That makes it vegan and vegetarian, and it is gluten-free. The non-GMO question is real: the feed sugar is often corn-derived and the mold strain may be engineered, so non-GMO status depends on the producer.