Perhaps that is why we can't absorb Vitamin C as efficiently from un-natural sources?

A Sour Deception: Citric Acid Comes From GMO Black Mold, Not Fruit
April 14th, 2014

Just what is your food made of, anyway? Try industrial synthesis, genetically modified mold secretions, hydrochloric acid, mercury-contaminated caustic soda, ferrocyanide… and, of course, lots of GMO corn.

If common ingredients like "citric acid" and "ascorbic acid (Vitamin C)" sound normal and familiar enough that you practically conjure up an image of the flourishing orchard they were grown in – then think again.

Picture instead an industrial factory, carrying out protocols developed in a lab, produced with enough winding nozzles, tanks, valves, pipes and other thinga-ma-jiggers to create a meandering and disorienting Dr. Seuss story. Because, after all, these common –nearly ubiquitous – ingredients don't come from where you might assume (i.e. simply, citrus fruits).

Instead, mass produced citric acid and ascorbic acid are hidden GMO ingredients that reportedly set off allergenic responses for some sensitive consumers. Further, both are known accomplices to the creation of benzene – a known human carcinogen – inside food and drink products alongside sodium benzoate.

Feel free to peruse these blogs and forums for complaints about citric acid from those allergic or intolerant to citric acid itself, mold & yeast and/or corn. Food intolerance to citric acid, or the components of its production, can trigger such symptoms as: stomach pain, reactions in the mouth, headaches, diarrhea, vomiting, cramping, hives, dark circles under the eye and/or blotchy skin.

Nevertheless, most people are not allergic to citric acid, and have no identifiable negative effects from eating it. But it does serve as a poignant reminder that what we eat comes from food products – constructed as if from tinker toys, with multiple, highly processed ingredients that virtually no one would recognize and few know anything about.......
A Sour Deception: Citric Acid Comes From GMO Black Mold, Not Fruit | Nutritional Anarchy