Are carrageenans (E407) dangerous?

No proven danger at usage doses according to EFSA, which found no concern about carcinogenicity or genotoxicity in its 2018 opinion. It did, however, judge the acceptable daily intake (75 mg per kilo of body weight per day) to be temporary and requested additional data, in particular on the low-molecular-weight fraction. The debate remains open, especially on the effect on the gut.

Do carrageenans cause intestinal inflammation?

Cell and animal studies have suggested an inflammatory effect, but they often use high doses or degraded carrageenans (poligeenan), which differ from the food additive. In humans, data are scarce: EFSA considers them inadequate, and a 2023 review calls for trials at realistic exposure levels. There is a signal to clarify, not established proof.

In which products is carrageenan found?

Mainly in dairy desserts, ice creams, plant milks and flavoured drinks, cooked charcuterie, ready meals and certain food supplements. It appears in the ingredient list as "thickener: carrageenan" or "thickener: E407". E407a corresponds to processed Eucheuma seaweed.

Can carrageenans be avoided?

Yes: read the ingredient list and look for "carrageenan", E407 or E407a. Many products do without it. It is a precautionary choice, not an established health requirement. For any question about digestive health, seek medical advice.

Carrageenans (E407): danger or false alarm?

What are carrageenans?

Carrageenans are polysaccharides, long chains of sugars, extracted fromred seaweed. They serve as athickener, gelling agent and stabiliser: they give body to a dessert cream, stop cocoa settling at the bottom of a chocolate milk, or keep a plant milk from separating. In the European Union, they carry the numberE407.

There is alsoE407a, processed Eucheuma seaweed. It contains carrageenan but also other components of the seaweed, with less thorough extraction. According to EFSA, the European Food Safety Authority, most carrageenans today come from two tropical seaweed species, Kappaphycus alvarezii and Eucheuma denticulatum. Carrageenans come in several types (kappa, iota, lambda) with different properties.

For general context on additives, our pilot articleAdditives: are they all a real danger?sets the scene.

Where is it found?

E407 is very widespread because it is effective at low doses and authorised in many food categories. In its 2018 opinion, EFSA notes that it is authorised in 79 food categories, including desserts, dairy analogues (such as plant drinks) and cooked meat products. It is mostly found in:

thedairy desserts: dessert creams, custards, flavoured yoghurts, ice creams;
theplant milksand flavoured drinks (chocolate, for example);
thecharcuteriecooked, such as ham, where it retains water;
theready meals, sauces and fine bakery products;
certainfood supplements.

In EFSA's exposure calculation, the categories contributing most to intake are flavoured dairy products, flavoured drinks, food supplements and fine bakery products.

EFSA's 2018 opinion: no danger signal, but reservations

As part of the re-evaluation of additives authorised before 2009, EFSA issued a detailed opinion on E407 and E407a in April 2018. Its reassuring findings come first:

carrageenanis not absorbed intactby the body;
in rats, no adverse effects in chronic toxicity studies up to7,500 mg per kilo of body weight per day, the highest dose tested;
no concernregarding carcinogenicity or genotoxicity (ability to damage DNA);
no effect on development in prenatal studies, at the doses tested.

EFSA maintained the group acceptable daily intake (ADI) of75 mg per kilo of body weight per day, but judged ittemporary. It asked for the database to be completedwithin five yearsof publication. The reasons: uncertainties about the chemistry of the additive, about exposure and about certain toxicological data.

Another point the general public often overlooks: in a cautious exposure scenario, known as "brand-loyal", EFSA estimated that intake could exceed this temporary ADI, in some cases by up to about tenfold: for high consumers in all population groups, and even at average intake except in infants and older people. It notes that exposure is probably overestimated, but that the extent of the exceedance "may constitute a safety concern".

The key point: the low-molecular-weight fraction

The scientific debate revolves around a question of molecule size. Thepoligeenanis a degraded carrageenan, obtained deliberately by intensive acid hydrolysis, with an average molecular mass of 10 to 20 kDa. It is not authorised in food, but it is used in the laboratory because it causes intestinal lesions in some animals (ulceration of the large intestine). Food-grade carrageenan, by contrast, has a much higher molecular mass, and these effects are not observed with it in the available studies.

The concern is thatlow-molecular-weight fractionsmay be present in the commercial additive, or form during food manufacture or digestion. The European specification limits to 5% the fraction with a mass below 50 kDa, but EFSA notes that there is no validated analytical method to measure it at that limit. It also noted that adequate studies with carrageenans of a mass close to 200 kDa were lacking, and that many studies describe poorly what they test.

EFSA therefore recommended to the European Commission, among other things, that it specify the molecular mass range more narrowly, validate a measurement method, strengthen limits on toxic metals and set numerical maximum levels for each use. In 2018, it launched a call for data, extended until 31 December 2022, covering the molecular mass distribution, stability in acid medium, and safety in infants under 16 weeks.

The gut debate: what the studies are worth

Part of the controversy stems from work published over several decades suggesting that carrageenan could promoteintestinal inflammation. A literature review published in 2023 by researchers at the Norwegian Institute of Public Health identified 262 publications on carrageenan and carboxymethylcellulose, in humans, animals and the laboratory. The most studied effects are inflammation, changes to the microbiota and intestinal permeability.

To judge the weight of these results, one must look at their nature:

most arestudies on cells or animals, sometimes at doses far above those found in ordinary diets;
many use poorly characterised or even degraded carrageenans, which prevents extrapolation to food carrageenan;
in humans, data are scarce: EFSA speaks of inadequate data on the possible role of exposure in inflammatory bowel diseases;
the authors of the 2023 review call for randomised trials at realistic exposure levels, especially in vulnerable people.

In short: there is asignal to clarify, but no established proof of an effect in humans at dietary doses. That is precisely what EFSA is asking to resolve.

Regulatory situation

In the European Union, E407 and E407a areauthorisedas additives. EFSA recalled in its opinion that the Scientific Committee on Food (SCF) judged in 1998 the use of carrageenan in infant formulas for newborns "inadvisable", a view reaffirmed in 2003, while accepting its use in foods for older infants. Conversely, the FAO/WHO expert committee (JECFA) concluded in 2015 that its use in infant formulas at concentrations up to 1,000 mg per litre posed no problem. These divergent positions explain EFSA's call for data on under-16-week-olds.

We found no specific ANSES opinion on carrageenan. In the United States, the National Organic Standards Board (NOSB) voted in 2016 to remove it from the list of non-organic ingredients allowed in organic products, judging that alternatives such as gellan, guar or xanthan gums existed, and not for safety reasons. In 2018, the US Department of Agriculture (USDA) kept carrageenan on the list.

Spotting them on the label, and what to think of them

In the ingredient list, carrageenan appears under its function followed by its name or number: "thickener: carrageenan" or "thickener: E407". E407a may also appear.

On Yumiq, the product page shows the number of additives detected and classifies them as harmless, to monitor or of concern. The Yumiq-Score penalises controversial additives assessed by EFSA and ANSES, and the Yumiq star requires the absence of any additive of concern.

What to take away?At usage doses, EFSA has not identified a proven danger, but it considers its ADI temporary and calls for data. The debate is real and remains open, especially on the low-molecular-weight fraction. Avoiding carrageenans is a possible choice, with no particular difficulty since many products do without them. It is not an established health requirement. For any question about digestive health, it is a medical opinion that counts, not a label.

Carrageenans (E407)