Is calcium propionate safe? The bread preservative explained
Where calcium propionate is allowed
United States
Permitted21 CFR 184.1221 lists calcium propionate as generally recognized as safe (GRAS) for use as an antimicrobial agent in baked goods, cheeses, confections and frostings, gelatins, puddings and fillings, and jams and jellies, with no limit other than current good manufacturing practice. The FDA's bread standard (21 CFR 136.110) also exempts calcium propionate used as a preservative in bread, rolls and buns from the 0.25-part cap on other yeast nutrients and calcium salts. [1, 2]
Canada
Permitted with conditionsHealth Canada's List of Permitted Preservatives (item C.2) sets limits by food: 2,000 ppm in bread and 2,000 ppm in named cheeses (both as propionic acid), 4,000 ppm in rotis and soft flour tortillas, and 2,000 ppm in other unstandardized foods, excluding unstandardized meat, fish and poultry preparations. [3]
European Union
Permitted with conditionsE 280-283 are authorised only in listed foods: for example prepacked sliced and rye bread up to 3,000 mg/kg, other prepacked bread 1,000 mg/kg, prepacked tortillas, pitta and rolls 2,000 mg/kg, and surface treatment of some cheeses. EFSA's 2014 re-evaluation found no safety concern at those authorised uses, and a 2016 regulation added tortillas. [4, 5, 6]
What is calcium propionate?
Calcium propionate is the calcium salt of propionic acid. US regulation describes it as white crystals made by neutralizing propionic acid with calcium hydroxide. In the EU it is regulated together with propionic acid (E 280), sodium propionate (E 281) and potassium propionate (E 283).
Propionates also occur in nature: EFSA notes they are naturally occurring substances in the normal diet, and the EU rules acknowledge that propionic acid and its salts may be present in certain fermented products simply as a result of fermentation.
Why it's used, and where you'll find it
It stops mold. The European Commission has noted that propionates are widely used against mold in leavened bakery products because they have minimal effect on yeast and on the odour or taste of the final product. It added tortillas to the EU list in 2016 because their high moisture and composition make them spoil quickly. Canada allows up to 2,000 ppm in bread and 4,000 ppm in rotis and soft flour tortillas.
What the research and regulators say
What EFSA concluded in 2014
EFSA's panel did not set an ADI. It concluded that the toxicity database did not allow one, noting that the only adverse effect reported was local irritation at the site of contact and that no systemic effects were reported in the studies, despite some gaps in the data. JECFA had earlier allocated 'not limited', and the EU's Scientific Committee on Food 'not specified'. The panel set aside forestomach changes in rodents as irrelevant to humans, who lack that organ, and based its reference points on reversible changes in the oesophagus lining in a 90-day dog study (no effect at 0.3% propionic acid in the diet, an effect at 1%). It saw no genotoxicity or carcinogenicity concern. Estimated exposure from additive use averaged 0.7 to 21.1 mg per kg of body weight per day. Because the 1% dietary level is three times higher than the concentration in food at the highest permitted levels, EFSA concluded there is no safety concern at currently authorised uses. The European Commission cited that conclusion in 2016 when it added tortillas to the permitted uses. [5, 6]
JECFA and IARC
The WHO/FAO expert committee JECFA allocated a group ADI of 'not limited' to propionic acid and its calcium, potassium and sodium salts in 1973 and maintained it at its 49th meeting in 1997, according to the WHO's JECFA database. IARC's List of Classifications (updated July 2026) has no entry for calcium propionate or propionic acid. [7, 8]
The 2002 trial on children's behaviour
Dengate and Ruben screened 56 children with behaviour problems, and 27 who improved on a restrictive diet that excludes additives, natural salicylates, amines and glutamates took part in a double-blind, placebo-controlled crossover trial of daily bread with calcium propionate or a placebo. The average behaviour scores did not differ significantly, partly because four children reacted to the placebo. However, more children worsened with the preservative (52%) than improved (19%), and the authors suggested irritability, restlessness, inattention and sleep disturbance in some children might be caused by it. EFSA reviewed the trial in 2014 and judged the evidence for an effect on children's behaviour limited, because of shortcomings in the crossover design and because the result was not confirmed by appropriate statistical testing; it also saw no plausible biological explanation. This is one small trial in a selected group, so it cannot say how most children respond. [5, 9]
Mouse and human hormone findings (2019)
A Science Translational Medicine paper reported that propionate raised glucagon and a protein called FABP4 in mice, increasing blood sugar, and that chronic exposure at a dose equivalent to that used for food preservation led to gradual weight gain in mice. In a randomized, double-blind, placebo-controlled human study, a propionate-containing meal raised glucagon, FABP4 and norepinephrine, with insulin resistance and compensatory hyperinsulinemia. The authors said further evaluation is warranted. These were hormone responses to a test meal, not evidence of disease in people, and EFSA's 2014 opinion predates the paper. We did not find a regulatory response to it in the sources we checked. [10]
French cohort and type 2 diabetes (2026)
A January 2026 Nature Communications paper from the French NutriNet-Sante cohort (108,723 adults, 1,131 new type 2 diabetes cases, diet recorded in repeated 24-hour food records) examined 17 widely used preservatives. Higher calcium propionate intake, compared with none, went with higher diabetes incidence (hazard ratio 1.44, 95% confidence interval 1.22 to 1.70). The same analysis reported associations for most of the other common preservatives it tested, including citric acid and acetic acid. The authors say an observational study cannot show cause, that residual confounding cannot be ruled out, that participants included more women, with higher education and healthier lifestyles, than the French population, and that the results need confirming; they call for the additives' safety to be re-evaluated. We did not find a regulator's response to it. [11]
Who might choose to avoid it
No regulator singles out a group that must avoid calcium propionate. Some parents who have noticed that food additives seem to affect their child's behaviour choose to avoid it, based largely on the 2002 trial; the evidence is limited.
How to spot it on a label
Look for 'calcium propionate' or, in the EU, 'E 282', usually labelled as a preservative. Its relatives are propionic acid (E 280), sodium propionate (E 281) and potassium propionate (E 283); one study used the code 'preservative 282'.
Check what's in your own productsScan a barcode or a label photo and Label X-Ray flags calcium propionate and everything else in plain English, with your allergies checked automatically.
Frequently asked questions
Is calcium propionate safe?
The FDA lists it as generally recognized as safe, and EFSA found no safety concern at currently authorised EU uses, though it set no numerical ADI. A small child-behaviour trial, a hormone study and a 2026 French observational study have raised questions, but all are limited.
Is calcium propionate banned in Europe?
No. It is authorised as E 282 in listed foods such as bread, fine bakery wares and the surface treatment of some cheeses, with maximum levels. The EU extended its use to tortillas in 2016.
Is calcium propionate natural?
The calcium propionate added to food is made by neutralizing propionic acid with calcium hydroxide, but propionates themselves occur naturally in the normal diet, according to EFSA.
Does calcium propionate cause cancer?
EFSA saw no genotoxicity or carcinogenicity concern in its 2014 re-evaluation, and IARC's List of Classifications has no entry for it.
Why is calcium propionate in bread?
It inhibits mold, and the European Commission notes it has minimal effect on yeast or on the taste and smell of leavened baked goods. Canada caps it at 2,000 ppm in bread.
Related ingredients
Sources
- eCFR (U.S. Government) — 21 CFR 184.1221 - Calcium propionate (accessed 2026-10-20)
- eCFR (U.S. Government) — 21 CFR 136.110 - Bread, rolls, and buns (accessed 2026-10-20)
- Health Canada — 11. List of Permitted Preservatives (Lists of Permitted Food Additives) (accessed 2026-10-20)
- EUR-Lex (European Union) — Regulation (EC) No 1333/2008 on food additives, consolidated text of 18.08.2026 (Annex II, Part E) (accessed 2026-10-20)
- EFSA — Scientific Opinion on the re-evaluation of propionic acid (E 280), sodium propionate (E 281), calcium propionate (E 282) and potassium propionate (E 283) as food additives (EFSA Journal 2014;12(7):3779, adopted 3 July 2014, published 22 July 2014) (accessed 2026-10-20)
- EUR-Lex (European Union) — Commission Regulation (EU) 2016/683 of 2 May 2016 amending Annex II to Regulation (EC) No 1333/2008 as regards the use of propionic acid - propionates (E 280-283) in tortillas (accessed 2026-10-20)
- WHO (JECFA database) — JECFA Evaluations - Calcium propionate (accessed 2026-10-20)
- IARC — List of Classifications (IARC Monographs on the Identification of Carcinogenic Hazards to Humans; data last updated 2026-07-23) (accessed 2026-10-20)
- PubMed (U.S. National Library of Medicine) — Controlled trial of cumulative behavioural effects of a common bread preservative (Dengate & Ruben, J Paediatr Child Health 2002, PMID 12173999) (accessed 2026-10-20)
- PubMed (U.S. National Library of Medicine) — The short-chain fatty acid propionate increases glucagon and FABP4 production, impairing insulin action in mice and humans (Tirosh et al., Sci Transl Med 2019, PMID 31019023) (accessed 2026-10-20)
- Nature Communications (via PubMed Central) — Associations between preservative food additives and type 2 diabetes incidence in the NutriNet-Sante prospective cohort (Hasenbohler et al., Nat Commun 2026;16:11199, PMID 41501013) (accessed 2026-10-20)
This page summarizes what regulators and published research say, as of the review date above. Rules and evidence change; check the linked sources for the latest. It is general information, not medical advice — talk to a doctor or pharmacist about your own health.