How citric acid is made
About 99% of commercial citric acid is produced by mold fermentation of sugar-rich substrates. The mold Aspergillus niger ferments glucose (from corn, beet, or cane) into citric acid, which is then purified by crystallization. No wheat is involved at any step.
The remaining citric acid (rare) is extracted from citrus fruits — also gluten free.
Where citric acid appears
- Sodas, juices, drink mixes (acidulant + flavor enhancer)
- Canned vegetables and fruits (pH control)
- Cheeses (mozzarella, ricotta)
- Cleaning products and dishwasher detergents
- Pharmaceuticals (effervescent tablets)
- Many supplements and gummies
The “yeast/mold” sensitivity question
A small subset of people report symptoms after consuming citric-acid-rich foods — but this is generally not gluten-related. If it bothers you, try a 30-day elimination, but routine GF dieting doesn’t require avoidance.
Sources
- Is Citric Acid Gluten Free? — Beyond Celiac (2024)
- Production of Citric Acid — Applied Microbiology and Biotechnology (2006)