Carrageenan: What It Is, Is It Bad for You & Safer Swaps

Carrageenan is a gel refined from red seaweeds, most famously Irish moss, that food makers add to plant milks, cream, ice cream, yogurt and deli meats to keep them thick, smooth and evenly mixed.129 It's an additive worth leaving out of your cart, because the research on it keeps coming back to the lining of your gut, and carrageenan-free versions of nearly every food it goes into are easy to find.

One ingredient on a long label can look too small to matter, but every ingredient you eat ends up in your gut. After taking care of tens of thousands of patients in my clinic and online, I can tell you that the single most overlooked organ when it comes to our health is our gut microbiome.10 Those bacteria live alongside your gut lining, the barrier that decides what reaches your bloodstream. When that barrier is worn down day after day, the low-grade inflammation that follows becomes a root cause of trouble far beyond digestion, and your blood sugar is one of the places it shows.1011

Keeping carrageenan off your plate starts with the label, and my guideline for any packaged food is a short one:

Check the label for carrageenan first, and then let that guideline sort what's left. If your gut has been giving you trouble, the free protocol below starts with Remove, taking out the processed foods and other inputs that keep your gut inflamed, and leaving carrageenan out fits right into that step.

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What is carrageenan?

Manufacturers start with red seaweeds such as Chondrus crispus, better known as Irish moss, along with Eucheuma and Gigartina, and extract the seaweed's gel-forming carbohydrate, a long chain of sugar units carrying sulfate groups.1 Chemists sort it into three main types, kappa, iota and lambda, by how many of those sulfate groups each chain carries and where they sit, and kappa and iota set into gels when they meet potassium or calcium.2 That's how a small amount of it holds a dessert together or keeps the cocoa in a carton of chocolate milk from settling to the bottom.2 In deli meats, it traps water in the meat and binds its juices, which raises the yield.12

Food-grade carrageenan vs. poligeenan

The carrageenan in food is a large molecule. Poligeenan, also called degraded carrageenan, is a much smaller one, made on purpose by breaking carrageenan apart with strong acid, at a pH of 0.9 to 1.3 and temperatures above 80°C (176°F), for an extended time.5 It isn't authorized or used in food, but it's the form behind the most serious animal findings, so it's worth knowing the difference when you read about carrageenan online. European reviewers did find that some carrageenan sold for food may not meet the EU limit on its smallest molecules, a fraction they tied to potential hazards similar to those of degraded carrageenan, and they asked for a tighter definition of what's allowed.5

A short history of carrageenan, and what the name means

People in Ireland have used Irish moss since about 400 AD, both as a gel and as a home remedy for coughs and colds, and carrageenan from red seaweeds was in use in China by around 600 BC.2 In 1862, a British pharmacist named Stanford extracted the gel from Irish moss and named it carrageen. The name later became carrageenan, to match the "-an" ending chemists use for carbohydrates like it. Industry began using it in the early 1930s, and the modern carrageenan industry took off in the 1940s, after manufacturers chose it to keep cocoa suspended in milk chocolate.2

In the seaweed itself, that gel comes packaged with everything else the plant carries. Per 100 grams, raw Irish moss, sold today as sea moss, has 8.9 mg of iron, 144 mg of magnesium and 182 micrograms of folate.13 Refining keeps the gel and leaves the rest of the seaweed behind, and USDA keeps no nutrient record for carrageenan itself.4

Is carrageenan bad for you?

Carrageenan is one to avoid, a step further than the "limit" advice for gums such as gellan gum and guar gum. Three reasons put it there:

• Your gut lining: it loosened the gut barrier in healthy men within two weeks, and in a placebo-controlled colitis trial, relapses came only in the group taking it.314
• Nothing to lose: carrageenan adds nothing to your nutrition,4 and nearly every food it goes into, from almond milk to whipping cream, comes in a version made without it.
• The same label rules: my list of additives to avoid tells you not to buy packaged foods with the emulsifiers carboxymethylcellulose (CMC) or polysorbate 80 (P80).7 Carrageenan isn't on that list, but U.S. rules allow it to work as an emulsifier too, and the research on it raises a similar concern for the gut lining.1

Regulators take a different view, and carrageenan is a listed food additive in the U.S.1 and authorized in Europe.5 None of them has settled what years of everyday intake do to the human gut, though, and until that's answered, the carrageenan-free carton is the easy choice for your family.

Why is carrageenan controversial?

If you've seen carrageenan called both perfectly safe and a gut irritant, you've walked into a debate that has run since the 1960s.

The debate started in animal labs in 1969, when researchers reported that guinea pigs given a seaweed extract developed ulcerative colitis,15 and later studies found that degraded carrageenan caused gut ulcers in guinea pigs, rabbits and monkeys.5 Injected into a rat's paw, carrageenan causes swelling so reliably that it has been a standard lab test for anti-inflammatory drugs since 1962.16 That's an injection rather than a meal, but it's one reason scientists started asking what carrageenan does inside the gut. In 1972, the FDA considered limiting the carrageenan in food to its larger molecules, a proposal that didn't go forward.17

The best-known critic is the physician and researcher Joanne Tobacman. In a 2001 review of the animal research, she concluded that both undegraded and degraded carrageenan had been tied to gut ulcers and tumors, and she described ways the food form might break down or act inside the gut. She wrote that "the widespread use of carrageenan in the Western diet should be reconsidered."17 Her research group went on to run two of the four human trials described below.149

On the other side, two 2014 reviews written by toxicology consultants argued that food-grade carrageenan is safe. In their reading, it isn't significantly absorbed, and rodents ate up to 5% of their diet as carrageenan with no harm beyond soft stools and no gut ulcers. They also argued that the immune effects seen when it's injected don't apply to eating it.1819

The argument reached the organic aisle in November 2016, when the National Organic Standards Board, which advises USDA on organic rules, recommended removing carrageenan from the ingredients allowed in organic foods, because alternatives such as gellan gum, guar gum and xanthan gum were available. In April 2018, USDA kept it on the list anyway, citing public comments that the substitutes didn't fully do carrageenan's job.20 That same year, European reviewers kept carrageenan on the market but made its acceptable daily intake temporary. They pointed to gaps in what's known about its chemistry, how much people eat and what it does in the body, and asked for better data within five years.5

Independent reviewers have landed in the middle. A 2018 review from Israel's Technion named three open questions: how much carrageenan people take in, how it behaves during digestion and around gut bacteria, and what it does in vulnerable guts, such as those of older adults or people with inflammatory bowel disease.21 A 2023 Norwegian review of the research on carrageenan and the intestines found only five research publications in people and called for larger trials at realistic doses.22 The trials in people that do exist are the heart of the next section.

How carrageenan affects your gut lining

Your gut lining is a single layer of cells under a protective coat of mucus, and its job is to let nutrients into your bloodstream while keeping bacteria, toxins and undigested food out. When it's healthy, it works like a fine net. When it's worn down, it's more like a net with a tear in it, and that's what people mean by leaky gut. Here's how I've described what happens once the barrier gives way:

On my show, I've named the biggest things damaging the gut microbiome: a low-fiber diet, antibiotics, chronic stress and too much sugar.10 Carrageenan isn't on that list, but it puts a smaller, everyday pressure on the same barrier, and it's one of the simplest pressures to take away. Because your body doesn't absorb it, carrageenan spends its whole trip through your gut in contact with that lining, and the steps below follow what it meets along the way.

The lab findings don't all point one way. In cells grown from people with Crohn's disease, kappa carrageenan didn't make the cell layer leakier in the dish, but it raised several inflammatory messengers, more so when inflammation was already there,25 which is why the trials in people matter most.

Even a healthy gut lining can loosen within two weeks, which is what a trial at a university hospital in Germany found. In that randomized trial of 20 healthy young men, each person tried both carrageenan and a placebo for two weeks at a time, and neither the people nor the researchers knew who got what.3 On 500 mg of carrageenan a day, stirred into unsweetened yogurt, the men's gut permeability rose on a standard lactulose-mannitol test, which 19 of them completed, and their blood zonulin, a marker tied to gut permeability, came in at 55.9 ng/L against 52.1 on placebo.3 The men had no symptoms and no side effects, so the barrier changed without anyone feeling it. The trial's main measure, insulin sensitivity, didn't change overall, and the blood-sugar section below covers what happened in the men with a higher BMI.3

If you live with ulcerative colitis, two small trials speak to you directly, and they don't fully agree. The longer one, a randomized, placebo-controlled trial at Chicago medical centers, followed 12 adults whose colitis was in remission. All of them ate a carrageenan-free diet, and they took either carrageenan capsules, working up from 100 mg to 200 mg a day, or a placebo for up to 12 months.14 Three of the 5 people taking carrageenan relapsed, against none of the 7 on placebo, and by the end their colitis activity scores averaged 4.20, against 0.86 on placebo. Within the carrageenan group, the inflammatory messenger IL-6 roughly doubled, from 2.57 to 5.00 pg/mL.14 The researchers chose 200 mg because it was below their estimate of what Americans eat in a day, they ended the trial once the relapse gap reached statistical significance, and they noted that a trial this small could be swayed by chance.14

A Finnish pilot tested a much bigger dose for a much shorter time. In this randomized, placebo-controlled trial, 7 women with colitis in remission each spent a week on a chocolate oat shake with 2,000 mg of carrageenan a day and a week on a comparison shake made with oat fiber. They ate a low-carrageenan diet throughout.26 Nobody flared, the inflammation markers didn't differ, and the women reported fewer gut symptoms on the carrageenan week, with a symptom score of 13.3 against 20.8 on the oat-fiber shake.26 One week can't show what months of eating it do, but it's a fair result to weigh beside the longer trial.

For anyone with colitis, the trial that ran longer is the closer match to daily life. If you're working on leaky gut or following an ulcerative colitis diet, a Crohn's disease diet or an IBS diet, taking carrageenan off your plate is one of the simplest Remove steps you can make, and you can start with the next carton you buy.

Does carrageenan affect your blood sugar?

Your blood sugar is one of the first places that trouble in your gut shows up. My Type 2 Diabetes Protocol explains that a leaky gut releases inflammatory signals that interfere with insulin signaling inside cells,11 and researchers have followed carrageenan down that same path.

The first clues came from mice given carrageenan in their drinking water at 10 mg per liter, which handled sugar worse, and from mouse liver and human liver cells grown in the lab, where carrageenan blocked insulin's signal.27

In people, the first test was a 12-week pilot in which every meal and snack was supplied. Adults with prediabetes were randomly assigned to the same diet with or without carrageenan-containing foods, about 250 mg of carrageenan a day, mostly from dairy foods and deli meats; 41 started, but only 13 finished.9 In the carrageenan-free group, HbA1c fell by an average of 0.12 percentage points and HOMA-IR, a measure of insulin resistance, dropped by 2.69, while the group eating carrageenan didn't change significantly. The difference between the two groups wasn't statistically significant for those main measures.9

In the German trial of 20 healthy men, the main result was reassuring, since two weeks of carrageenan didn't change their insulin sensitivity overall. In an extra analysis, though, the men with a higher BMI did worse on carrageenan than on placebo, with lower insulin sensitivity, higher insulin resistance, and higher CRP and IL-6, two markers of inflammation.3 These were young men, lean to overweight, so the finding can't say what carrageenan does in people with diabetes, but it fits the gut-to-blood-sugar path above.

The largest numbers come from France, where a cohort of about 100,000 adults has tracked food additives against health over several years. Carrageenan showed no link with cardiovascular disease there,6 but people who took in more of it were more likely to develop type 2 diabetes, an association that can't prove carrageenan was the cause.28 If you're watching your blood sugar, a carrageenan-free kitchen fits naturally into an insulin resistance diet.

Foods that contain carrageenan

These are the foods where carrageenan commonly shows up, so they're the labels worth reading first:4912

Cream is a good place to see how much labels vary, and it's worth checking before the holidays, when eggnog and whipped cream are back on the table. One whipping cream in USDA's database lists whipping cream, carrageenan, sodium phosphate, sodium citrate and magnesium, one heavy cream lists cream, carrageenan, mono and diglycerides and polysorbate 80, and one eggnog includes guar gum and carrageenan among its ingredients.303132

Carrageenan also turns up where you might not think to look. Some beers contain it,9 it goes into pet foods, which European regulators reviewed as a feed additive in 2022,33 and toothpaste makers use it as a stabilizer.2 Because USDA kept it on the list of ingredients allowed in organic foods, an organic label doesn't rule it out either, so the ingredient list is the only place to check.29

Carrageenan-free swaps for milk, cream and desserts

Start with plant milks, where carrageenan is a common stabilizer.9 When I ranked dairy alternatives on my show, coconut milk came first, and for a nut or seed milk, I recommended one that's unsweetened and has minimal additives.34 My food lists put canned coconut milk and cream, plain almond milk and plain macadamia nut milk on the eat side, with soy, rice and oat milk on the avoid side.7

Making your own is simpler than it sounds. Homemade almond milk needs only soaked almonds and water, and you can make coconut milk from a fresh coconut. Without a stabilizer, homemade and carrageenan-free milks settle in the fridge, so give the jar a good shake before you pour.

For yogurt, kefir and cream, my food lists put goat and sheep dairy ahead of regular cow's dairy, list canned coconut cream on the eat side, and favor full-fat dairy that's organic and grass-fed.7 So reach for goat milk or sheep milk yogurt and kefir, coconut kefir, or canned coconut cream with the shortest label you can find. If you use dairy cream, an organic, grass-fed A2 cream whose label lists only cream is an option if you tolerate it.7

To thicken and set foods at home, you don't need a powdered gel at all. These whole foods do the job:

When a recipe does call for a gel or a thickener, these five are common stand-ins for carrageenan, and the first three are the ones to reach for:

• Agar: also made from red seaweed, it sets firm, vegan gels for jellies and desserts.2
• Pectin: the fiber that sets jam, found naturally in fruits such as citrus and apples.
• Gelatin: choose beef gelatin or fish gelatin to set panna cotta, gummies and jellies.
• Guar gum and gum arabic: both are still additives that count toward your five ingredients, and the French cohort that tied carrageenan to type 2 diabetes tied both of these gums to it too,28 which is why agar, pectin and gelatin come first.

Carrageenan uses outside food: colds, coughs and digestion

Long before carrageenan went into food, the seaweed it comes from was a home remedy for coughs and colds, and today carrageenan itself goes into a nasal spray that can help a cold clear sooner. None of the uses below involves eating the refined gel in a carton of plant milk.

Carrageenan side effects and who should skip it

Who should skip it most. If you have ulcerative colitis, the colitis trial above is the one to weigh, since relapses came only in the group taking carrageenan.14 Crohn's disease belongs here too, since carrageenan raised inflammatory messengers in cells from people with Crohn's.25 The same goes for anyone working on a leaky gut, for people with prediabetes, the group in the 12-week feeding pilot,9 and for men with a higher BMI, who fared worse in the German trial's extra analysis.3 For all of them, the how-to is the same: read labels and choose the carrageenan-free version.

Infants. Regulators disagree here. European advisers have called carrageenan inadvisable in infant formula fed from birth, while the World Health Organization's expert committee on food additives found up to 1,000 mg per liter in infant formula not of concern.5 If your baby's formula contains it, look for a carrageenan-free formula of the same type, so the new one still meets your baby's needs, and save the homemade milks on this page for older kids and adults, since they can't replace formula.

Allergy. It's rare, but one documented case of anaphylaxis to carrageenan happened during a barium enema, and the gut symptoms that led to the test went away on a carrageenan-free diet.39 If you react to foods that contain it, leave it out from then on, and if a reaction ever brings trouble breathing, throat swelling or faintness, call 911 right away.

Large amounts. Like other bulk-forming fibers, carrageenan taken in very high amounts can cause gas and digestive discomfort.5

The cancer question. In 1983, the International Agency for Research on Cancer classified degraded carrageenan as possibly carcinogenic to humans (Group 2B), based on rat studies, and placed food-grade carrageenan in Group 3, not classifiable.5 I've written that many plant-based milks are filled with sugar, thickeners and gums, some of which cause cancer in lab rats.7 For food-grade carrageenan, the rat finding is narrower, since it didn't start early precancerous changes in the colon but did promote their growth.40 In people, a French cohort of 92,000 adults found that the women with the highest carrageenan intake had a 32% higher risk of breast cancer than those with the lowest. For a woman of 60, that worked out to an estimated 5.2% risk against 4.1%, a finding the researchers said needs replication.41

When to get checked. If you live with inflammatory bowel disease and see blood in your stool or other signs of a flare, stop eating carrageenan and see your gastroenterologist promptly.

The bottom line

Carrageenan: frequently asked questions

References

1. US Food and Drug Administration. Carrageenan. 21 CFR 172.620. Electronic Code of Federal Regulations, accessed 2026-11-06.
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19. McKim JM. Food additive carrageenan: Part I: A critical review of carrageenan in vitro studies, potential pitfalls, and implications for human health and safety. Crit Rev Toxicol. 2014;44(3):211-43. doi:10.3109/10408444.2013.861797. PMID:24456237
20. Agricultural Marketing Service, USDA. National Organic Program: USDA Organic Regulations (notification of 2018 sunset review). 83 FR 14347. April 4, 2018.
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27. Bhattacharyya S, O-Sullivan I, Katyal S, Unterman T, Tobacman JK. Exposure to the common food additive carrageenan leads to glucose intolerance, insulin resistance and inhibition of insulin signalling in HepG2 cells and C57BL/6J mice. Diabetologia. 2012;55(1):194-203. doi:10.1007/s00125-011-2333-z. PMID:22011715
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34. Axe J. Natural Sunscreens, EMF Exposure, & the Best Dairy Alternatives | Q&A. The Dr. Josh Axe Show; 2024. Dairy alternatives ranked, with a nut or seed milk that is unsweetened and has minimal additives, at 38:22; YouTube: https://www.youtube.com/watch?v=C-HsQGa7aOo&t=2302s.
35. Hemilä H, Chalker E. Carrageenan nasal spray may double the rate of recovery from coronavirus and influenza virus infections: Re-analysis of randomized trial data. Pharmacol Res Perspect. 2021;9(4):e00810. doi:10.1002/prp2.810. PMID:34128358
36. Ludwig M, Enzenhofer E, Schneider S, Rauch M, Bodenteich A, Neumann K, et al. Efficacy of a carrageenan nasal spray in patients with common cold: a randomized controlled trial. Respir Res. 2013;14(1):124. doi:10.1186/1465-9921-14-124. PMID:24219370
37. Eccles R, Winther B, Johnston SL, Robinson P, Trampisch M, Koelsch S. Efficacy and safety of iota-carrageenan nasal spray versus placebo in early treatment of the common cold in adults: the ICICC trial. Respir Res. 2015;16:121. doi:10.1186/s12931-015-0281-8. PMID:26438038
38. Eccles R, Meier C, Jawad M, Weinmüllner R, Grassauer A, Prieschl-Grassauer E. Efficacy and safety of an antiviral Iota-Carrageenan nasal spray: a randomized, double-blind, placebo-controlled exploratory study in volunteers with early symptoms of the common cold. Respir Res. 2010;11(1):108. doi:10.1186/1465-9921-11-108. PMID:20696083
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Dr. Josh Axe, DC, DNM, CNS

Doctor of Natural Medicine · Founder, DrAxe.com

Dr. Axe is a certified doctor of natural medicine, clinical nutritionist, and multiple New York Times bestselling author. He has spent 20+ years in clinical practice helping people heal at the root cause and founded one of the most-visited natural-health platforms in the world.

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