As of: 2026-09-11 Of the seventeen preservatives a new study tracked across more than 112,000 French adults, the one that turned up a statistically significant link to cardiovascular disease wasn't a synthetic sulfite or a nitrite. It was ascorbic acid. Vitamin C. That detail is the actual story here, and it's more interesting than the headline version making the rounds. The study is Hasenbohler et al., published as an advance article in the European Heart Journal on May 20, 2026 (DOI 10.1093/eurheartj/ehag308), drawing on the French NutriNet-Santé cohort. Researchers followed 112,395 adults (78.7% women, cohort recruitment running 2009 to 2024, median follow-up 7.9 years) who logged repeated 24-hour dietary records, letting the team estimate individual exposure to specific preservative additives rather than just food categories. They split preservatives into two groups: non-antioxidant preservatives (things like sorbates, nitrites, sulfites) and antioxidant preservatives (ascorbic acid and its relatives, plus rosemary extract). Higher intake of non-antioxidant preservatives was associated with a 29% higher rate of hypertension (HR 1.29, 95% CI 1.20–1.39) and a 16% higher rate of cardiovascular disease (HR 1.16, 95% CI 1.04–1.29) over the follow-up period. Higher intake of antioxidant preservatives was associated with a 22% higher rate of hypertension (HR 1.22, 95% CI 1.13–1.31) — but not, as a category, with cardiovascular disease. That last point is why ascorbic acid stands out. When the researchers broke the antioxidant-preservative category down into its individual compounds, ascorbic acid (E300) alone showed a significant association with cardiovascular disease, even though the broader category it belongs to did not. The individual compound diverged from its own group average. Eight individual additives across both categories showed significant associations with hypertension after correction for multiple testing: potassium sorbate, potassium metabisulphite, sodium nitrite, ascorbic acid, sodium ascorbate, sodium erythorbate, citric acid, and rosemary extract. The study's funding came from French public research institutions, an ERC Horizon Europe grant (ADDITIVES, No. 864219), and the Bettencourt-Schueller Foundation; the authors reported no personal conflicts of interest. This isn't the NutriNet-Santé team's first pass at food additives. The same cohort has previously been used to study emulsifiers and cancer incidence and emulsifier mixtures and type 2 diabetes risk, part of a running research program (the ERC ADDITIVES grant funds several of these analyses) built specifically to ask what happens when additive intake is measured compound-by-compound instead of lumped as "processed food." That's the throughline: this study is one entry in an ongoing effort to disaggregate a category that regulators have historically evaluated compound-by-compound too, just for different reasons — safety thresholds, not epidemiological association. The finding drew prompt, public pushback, which is itself worth reporting plainly. The UK's Science Media Centre collected reactions from two independent scientists in May 2026. Rachel Richardson, a methods manager at the Cochrane Collaboration, noted the study is observational — it cannot establish causation — and that the cohort skews healthier and more female than the general population, which may limit how far the findings generalize. Professor Gunter Kuhnle of the University of Reading went further, arguing that reliable data on individual additive intake is hard to come by since manufacturers aren't required to disclose exact additive levels, and that grouping chemically diverse compounds together risks capturing dietary patterns rather than the additives themselves. Kuhnle's stated conclusion: "Consumers should not be concerned by the findings of this study." In the same disclosure spirit this newsletter applies to its own sourcing, Kuhnle disclosed that he received research funding from Mars between 2010 and 2020 and currently sits on the UK's Advisory Committee on Novel Foods. On the regulatory side, neither the FDA nor EFSA has issued a statement responding to this specific study as of this writing. But the additives it names aren't new to regulators. Ascorbic acid is GRAS (generally recognized as safe) under FDA rule 21 CFR 182.3013. Sodium nitrite is permitted by the FDA under 21 CFR 172.175 at up to 200 parts per million in cured fish and meat and 10 ppm in smoked cured tuna; USDA's parallel meat and poultry rule, 9 CFR 424.21, governs which curing ingredients are approved for use, with specific concentration limits cross-referenced to 9 CFR Part 319. None of the eight named additives are banned in the U.S. or the EU. Where regulators have actually moved on one of them, it predates this study and had nothing to do with cardiovascular risk: EFSA's 2017 re-evaluation of sodium and potassium nitrite flagged concerns about nitrosamine formation, a cancer-related pathway, and the EU responded with Commission Regulation (EU) 2022/1923, lowering the maximum permitted nitrite and nitrate levels across meat, fish, and cheese products, with a multi-year compliance window running into 2025. The U.S. limits under 21 CFR 172.175 have not been revised to match. That's a genuine transatlantic divergence — but it's about nitrosamines, not this study's hypertension or CVD signal. On a U.S. label, these additives appear by name or E-number equivalent, most often in cured and processed meats, baked goods, juices, and preserved produce: "sodium nitrite" on bacon and deli meat, "ascorbic acid" or "vitamin C" (frequently added to cured meats specifically to help block nitrosamine formation — the same chemistry the EU tightened rules around), "citric acid" on almost anything shelf-stable, and "rosemary extract" increasingly substituted in for synthetic antioxidants on products marketed as free of artificial preservatives. All of it is disclosed. None of it is hidden behind a generic "natural flavors" line. PurityIQ doesn't turn any of this into a score or a verdict. It puts the primary record in front of you at the shelf — which preservatives are in a product, what a study like this one actually found and didn't find, and what independent scientists said about its limits — cited to the source, so you can weigh it yourself.
Sources
Hasenbohler A, Javaux G, Payen de la Garanderie M, et al. "Preservative food additives, hypertension, and cardiovascular diseases: the NutriNet-Santé study." European Heart Journal, 2026. https://doi.org/10.1093/eurheartj/ehag308 Science Media Centre, expert reaction, May 2026. https://www.sciencemediacentre.org/expert-reaction-to-study-looking-at-food-preservatives-blood-pressure-and-heart-disease/ European Society of Cardiology, press release. https://www.escardio.org/news/press/press-releases/common-food-preservatives-linked-to-high-blood-pressure-and-heart-disease/ 21 CFR 172.175 (sodium nitrite). https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-172/subpart-B/section-172.175 21 CFR 182.3013 (ascorbic acid, GRAS). https://www.ecfr.gov/current/title-21/chapter-I/subchapter-B/part-182/subpart-D/section-182.3013 9 CFR 424.21 (USDA/FSIS approved curing ingredients). https://www.ecfr.gov/current/title-9/chapter-III/subchapter-E/part-424/subpart-C/section-424.21 EFSA Journal. "Re-evaluation of potassium nitrite (E 249) and sodium nitrite (E 250) as food additives." 2017;15(6):4786. Commission Regulation (EU) 2022/1923 (amending Regulation (EC) No 1333/2008 as regards nitrites/nitrates).