Fillers and stabilizers
Citric acid
Definition
What it is
Citric acid (manufactured): almost entirely derived from Aspergillus niger mold fermentation, not citrus fruit. Relevant for mold-sensitive individuals; the label 'citric acid' does not indicate natural citrus sourcing.
On the label
Label names covered by this flag
- citric acid
- e330
Regulation
Regulatory status
No bans or restrictions are recorded for this ingredient in the jurisdictions clearlabel tracks (US, EU, UK, Canada, Japan, Australia/NZ, Brazil).
Explainer
In plain language
Citric acid is a sour-tasting acid used to add tartness, adjust acidity, and act as a preservative in a huge range of foods and drinks. While it occurs naturally in lemons and limes, the citric acid added to packaged foods is almost always manufactured, produced by fermenting sugars with a mold called Aspergillus niger. It appears on labels as citric acid or E330.
Assessment
Why it is flagged
Manufactured citric acid is broadly recognized as safe by regulators including the FDA and EFSA, and it is one of the most widely used food additives in the world. Clear Label flags it for a narrower reason: the label 'citric acid' does not mean the product contains citrus, and the additive is produced through mold fermentation. A small number of people report sensitivity reactions such as digestive upset or skin symptoms that they associate with manufactured citric acid, and some case reports in the literature have described inflammatory-type reactions, but this evidence is limited and not established as a general effect. Clear Label surfaces it so mold-sensitive users and those tracking reactions can test the pattern in their own logs, not because harm is documented at normal intakes.
In the aisle
Where it commonly shows up
- Sodas and flavored waters
- Sour candy and gummies
- Canned tomatoes and vegetables
- Fruit juices and drink powders
- Jams, jellies, and fruit fillings
- Ready-made sauces and dressings
Practical
Reading the label
It is listed simply as citric acid or E330 and rarely hides. Seeing it does not tell you whether the source is citrus fruit or fermentation, and in commercial products it is almost always the fermented version regardless of any citrus imagery on the package.
FAQ
Common questions
Is citric acid made from lemons?
Almost never in packaged food. Most commercial citric acid is produced by fermenting sugars with the mold Aspergillus niger, because that is far cheaper than extracting it from citrus fruit.
Is manufactured citric acid safe?
Regulators including the FDA and EFSA treat it as safe at the levels used in food. It is one of the most common food additives worldwide.
Why would a mold-sensitive person track it?
Because it is produced through mold fermentation, some people who react to mold-derived ingredients choose to watch it. Reports of sensitivity are limited and not well established, so it is a pattern to test in your own logs rather than a documented effect.
Citations
Sources
Citation
Primary reference
About this page: the definition, label names, severity, and regulatory chips come from the clearlabel ingredient taxonomy, the same data the scanner uses to score products. Research summaries describe associations reported in published studies, not diagnoses; individual responses vary. Scan any product with clearlabel to see which of its ingredients carry flags.