Anhydrous citric acid — answers to citric acid
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A water-free form of citric acid, a naturally occurring acid found in citrus fruits and also produced industrially by fermentation. In supplements it functions as an acidulant, flavoring agent, and pH adjuster rather than as an active ingredient.
Why it’s used
Added to adjust tartness, balance flavor, or stabilize the pH of a formulation, and sometimes to help effervescent tablets fizz when combined with a carbonate or bicarbonate.
What the evidence says
There is no efficacy question here because it is not taken for a health effect; it is a formulation ingredient. Citric acid has a long history of use in foods and supplements, and food-grade use is well established as generally recognized as safe by regulatory bodies.
Where we looked
There was no paper to cite here, so this is the search instead — run it yourself and see what we saw.
- PubMed: 0 records · searched August 2026
"Anhydrous citric acid"[Title/Abstract] AND ("dietary supplements"[MeSH] OR supplementation[Title/Abstract] OR supplement[Title/Abstract] OR supplements[Title/Abstract] OR "oral administration"[Title/Abstract]) AND (randomized controlled trial[pt] OR clinical trial[pt] OR meta-analysis[pt] OR systematic review[pt]) AND humans[MeSH] - PubMed: 44 records · searched August 2026
"Anhydrous citric acid"[Title/Abstract]
This says what this database holds under these terms. It is not a finding that no research exists.
Context
Amounts used are whatever a formulator needs for taste or pH, not a dose studied for any physiological outcome.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.