Benzoic acid

Studies in people

• Open question

  Where salicylic acid comes from⁵

  Benzoic acid eaten by people turned into salicylic acid in the body, but scientists do not yet know how much it adds.

• Concern

  Skin reaction to food⁶

  Benzoic acid in a salad cream was linked to short-lived skin bumps in children and adults.

Animal and lab studies only

• Open question

  Gut health in pigs¹³

  In pig studies, benzoic acid improved gut function at some levels, but too much damaged gut health.

• Concern

  Combined additive kidney harm¹⁴

  In lab studies, benzoic acid and acesulfame K together strongly slowed kidney cell growth.

• Open question

  Skin reactions to food preservatives¹⁵

  In lab studies, 2% benzoic acid caused skin reactions like welts, redness, and itching in some people.

Study type not stated

• Open question

  Preservative health effects¹⁰

  Benzoic acid is used as a preservative in food, but its effects on health are still debated.

• Open question

  Kidney disease and vitamin C¹¹

  Scientists do not yet know whether benzoic acid reacts with vitamin C in people with kidney problems.

Single cases of misuse or overdose

One person or one incident, such as an accidental overdose or a mistake in a kitchen or factory. They are real, but a single case does not show what happens at normal amounts, so the signal does not count them.

• Allergic reactions to food⁹

  A chemical worker had severe allergic reactions to benzoic acid, and later milder ones when eating foods containing it.

How it’s made and used

• How much we eat²

  In people, the amount of benzoic acid eaten from processed food stayed well below the daily limit.

• Daily intake in adults³

  Benzoic acid intake in Belgian adults stays below the safe limit, with soft drinks the main source.

• How much kids drink⁴

  In Hong Kong students, benzoic acid from pre-packaged drinks stayed well under the daily intake limit.

• Preservative intake in young children⁷

  In Taiwan, young children and older women eating the most benzoic acid stayed below the daily intake limit.

• How the body clears it⁸

  In people, drinking flavored water with benzoic acid raised hippuric acid in urine within an hour, then it returned to normal.

• How the body processes it¹²

  Scientists say the safe daily amount of benzoic acid could be doubled, based on how the body handles it.

The signal at the top counts the findings in people and in animal and lab studies. A concern in studies of people outranks animal and lab studies, and “No concerns” needs at least one finding in people. When most findings in people point one way, the page leans that way (“Mostly”), and every finding is still shown. Findings whose study type is not stated are shown but not counted. This page is a reference, not medical advice. It describes what regulators and published research say. Talk to a doctor or dietitian about your own diet.