The vitamin C and preservative that produced benzene in cans
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The vitamin C and preservative that produced benzene in cans
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The vitamin C and preservative that produced benzene in cans
In this episode, we trace how routine labels-ascorbic acid and sodium benzoate-came together in warm, light-filled conditions to create benzene in commercial beverages, and how regulators and manufacturers responded over more than a decade. What choices and gaps left those drinks on shelves despite documented chemistry?
Person: unnamed former FDA chemist
Date: 1993 (first peer-reviewed documentation), 1998 (quiet withdrawals), 2005-2006 (citizen tests and public disclosures)
Location: United States (tests and FDA correspondence); United States and Germany (investigations)
Topic: benzene formation from ascorbic acid and sodium benzoate in beverages
- A gas-station cooler, summer heat and light accelerated benzene formation in a vitamin-enriched can that tested 87.9 ppb.
- Ascorbic acid (vitamin C) and sodium benzoate are common label ingredients whose reaction with metal ions can release benzene.
- Researchers documented the chemistry in 1993 and advised fixes like EDTA chelators and sugars to inhibit formation.
- The FDA learned of the issue, requested voluntary reformulation, tested beverages, and set no mandatory benzene limit for soft drinks.
- Public awareness rose after a citizen’s 2005 test and a former FDA chemist’s 2006 disclosure, prompting UK and German investigations.
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