NutriDex

The Supplement Research Compendium
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Carrageenan

E407

A red-seaweed thickener (E407) that regulators worldwide deem safe in food, though small human and animal studies keep a gut-inflammation question open.

Mixed evidence 🍬Sweeteners & Additives

✚ Updated · How we grade evidence

Evidence tier
Mixed
Research weight
Citations
9 verified / 9
Classification
Sweeteners & Additives
❝
What the evidence says. Conflicting results across studies; benefit uncertain.

What is Carrageenan?

Carrageenan (E407) is a sweetener or food additive used for gelling and thickening agent — forms heat-reversible gels (kappa/iota types) used to set and texturize foods. NutriDex grades the human evidence as Mixed. Carrageenan (E407) is a high-molecular-weight sulfated polysaccharide extracted from red seaweeds (mainly Eucheuma, Chondrus, and Gigartina species) and used as a gelling, thickening, and stabilizing agent. It is permitted in the EU (E407) and is FDA-affirmed GRAS in the US (21 CFR 172.620/182.7255). Authoritative bodies — JECFA (ADI "not specified," reaffirmed for infant formula in 2014/2015) and EFSA (2018, group ADI 75 mg/kg bw/day, made temporary pending better data) — concluded food-grade carrageenan is not carcinogenic and is safe at use levels. The human evidence is mixed: a small no-carrageenan RCT in ulcerative colitis and a 2024 crossover RCT in overweight adults suggest possible gut-permeability and inflammatory effects, but these are small and contested, and much historical "harm" data used poligeenan (degraded carrageenan), a different acid-hydrolyzed material never used in food.

Purported Benefits

✓Gelling and thickening agent — forms heat-reversible gels (kappa/iota types) used to set and texturize foods
✓Stabilizes emulsions and suspensions — keeps cocoa in chocolate milk and prevents whey separation in dairy
✓Provides body and mouthfeel in low-fat and plant-based products without adding calories or sugar
✓Binds water and improves slice/firmness in processed meats and deli products
✓Zero glycemic and negligible caloric impact — an indigestible dietary fiber-type polysaccharide
✓Topical/non-food: purified iota-carrageenan nasal sprays show antiviral activity in RCTs (distinct from dietary use)

Dosing & Compounds

Typical Dose
EU: authorized food additive E407 (and E407a); EFSA 2018 set a temporary group ADI of 75 mg/kg body weight/day for E407 + E407a, made temporary pending improved data within 5 years (no carcinogenicity concern; subchronic NOAEL 3,400-3,900 mg/kg/day). JECFA: ADI "not specified" (i.e., no numerical limit needed at typical intakes), and in 2014/2015 concluded use in infant formula up to 1000 mg/L is not of concern. US FDA: food-grade carrageenan is affirmed GRAS and regulated under 21 CFR 172.620 (carrageenan) and 182.7255; specifications restrict low-molecular-weight (degraded) fractions.
Active Compounds
E-number E407 (E407a = semi-refined / processed Eucheuma seaweed, PES)Three main types: kappa, iota, and lambda carrageenanDairy and dairy alternatives: chocolate milk, ice cream, whipped/squirt cream, cottage cheese, yogurt drinks, plant milks (almond/oat/soy)Processed and deli meats, pate, and reformed meat productsInfant formula (permitted up to 1000 mg/L per JECFA)Desserts, jellies, sauces, dressings, nutritional/meal-replacement shakesSometimes labeled 'carrageenan,' 'Irish moss extract,' or 'seaweed extract'; common in supplier brands (e.g., Genu, Gelcarin, Viscarin)

Safety & Cautions

Food-grade carrageenan is poorly absorbed and has been repeatedly judged non-carcinogenic and safe at use levels by JECFA, EFSA, and the FDA. The principal open question is gastrointestinal: animal and cell models show food-grade carrageenan can degrade the colonic mucus barrier, shift microbiota (lowering Akkermansia muciniphila), and activate TLR4/NF-kB inflammatory signaling, and a small double-blind RCT (Bhattacharyya 2017) found a no-carrageenan diet lengthened time to relapse in ulcerative colitis. A 2024 crossover RCT (Naimi, BMC Medicine) found 500 mg/day carrageenan did not change insulin sensitivity overall but increased intestinal permeability and, in overweight participants, lowered insulin sensitivity and raised CRP/IL-6. These trials are small and industry-funded critiques note they used bolus capsules rather than food-bound carrageenan. A crucial distinction: most alarming older data used poligeenan ("degraded carrageenan"), an acid-hydrolyzed low-molecular-weight material never permitted in food and not the same as the food additive. People with active inflammatory bowel disease (Crohn's, ulcerative colitis) who wish to be cautious may reasonably choose to limit it; for the general population the regulatory consensus is reassuring. Educational only — always check with your doctor or pharmacist before combining Carrageenan with any medicine.

Key Studies

regulatory FDA Food Substances database ✓ Source
Food-grade carrageenan is FDA-affirmed GRAS and regulated as a direct food additive (21 CFR 172.620) and emulsifier/stabilizer (21 CFR 182.7255), with specifications limiting low-molecular-weight fractions.
regulatory EFSA ANS Panel 2018 ✓ Source
Re-evaluation concluded no concern for carcinogenicity and no adverse effects in chronic rat studies up to 7,500 mg/kg/day, but set a temporary group ADI of 75 mg/kg bw/day for E407/E407a pending better chemistry, exposure, and toxicology data.
regulatory JECFA 2015 (FAO/WHO) ✓ Source
Reaffirmed an ADI 'not specified' for food-grade carrageenan and concluded use in infant formula and formula for special medical purposes at up to 1000 mg/L is not of safety concern.
rct RCT crossover, n=20 (Naimi 2024, BMC Medicine) ✓ PubMed
Oral carrageenan 250 mg twice daily for 2 weeks did not change whole-body insulin sensitivity overall but increased intestinal permeability, and in overweight subjects significantly lowered insulin sensitivity and raised CRP and IL-6.
rct RCT, n=12 (Bhattacharyya 2017) ✓ Full text
In a double-blind multicenter trial of ulcerative colitis patients in remission, those given carrageenan capsules relapsed earlier than placebo (3 of 5 vs 0 of 7 by study end), suggesting dietary carrageenan restriction may benefit some UC patients.
Review Arslan 2026 ✓ PubMed
Carrageenan: Food Additive or Health Concern? A Comprehensive Review
review Mechanistic review (Nutrients 2024) ✓ PubMed
Review concluded food-grade carrageenan can degrade the colonic mucus barrier, reduce Akkermansia muciniphila, and activate TLR4/NF-kB pro-inflammatory signaling in animal and cell models, flagging IBD patients as the population of greatest theoretical concern.
review Critical review (McKim 2019) ✓ Source
Industry-affiliated reanalysis of the Bhattacharyya UC trial argued its small size, bolus-capsule dosing, and methodology limit conclusions, and reiterated that global regulators consider food-grade carrageenan safe and distinct from poligeenan.
animal Piglet infant-formula study (Weiner 2015) ✓ PubMed
An infant-formula toxicity/toxicokinetic feeding study in preweaning piglets found no adverse effects on the immune system or gastrointestinal tract attributable to carrageenan, supporting JECFA's infant-formula conclusion.
9 sources cited · 9 verified Search all studies on PubMed ↗

Common questions about Carrageenan

What is Carrageenan used for?

Carrageenan is most often taken for Gelling and thickening agent — forms heat-reversible gels (kappa/iota types) used to set and texturize foods, Stabilizes emulsions and suspensions — keeps cocoa in chocolate milk and prevents whey separation in dairy, Provides body and mouthfeel in low-fat and plant-based products without adding calories or sugar, Binds water and improves slice/firmness in processed meats and deli products. A red-seaweed thickener (E407) that regulators worldwide deem safe in food, though small human and animal studies keep a gut-inflammation question open.

Does Carrageenan work — what does the evidence say?

Mixed evidence. Conflicting results across studies; benefit uncertain. Carrageenan (E407) is a high-molecular-weight sulfated polysaccharide extracted from red seaweeds (mainly Eucheuma, Chondrus, and Gigartina species) and used as a gelling, thickening, and stabilizing agent. It is permitted in the EU (E407) and is FDA-affirmed GRAS in the US (21 CFR 172.620/182.7255). Authoritative bodies — JECFA (ADI "not specified," reaffirmed for infant formula in 2014/2015) and EFSA (2018, group ADI 75 mg/kg bw/day, made temporary pending better data) — concluded food-grade carrageenan is not carcinogenic and is safe at use levels. The human evidence is mixed: a small no-carrageenan RCT in ulcerative colitis and a 2024 crossover RCT in overweight adults suggest possible gut-permeability and inflammatory effects, but these are small and contested, and much historical "harm" data used poligeenan (degraded carrageenan), a different acid-hydrolyzed material never used in food.

What is the typical dose of Carrageenan?

EU: authorized food additive E407 (and E407a); EFSA 2018 set a temporary group ADI of 75 mg/kg body weight/day for E407 + E407a, made temporary pending improved data within 5 years (no carcinogenicity concern; subchronic NOAEL 3,400-3,900 mg/kg/day). JECFA: ADI "not specified" (i.e., no numerical limit needed at typical intakes), and in 2014/2015 concluded use in infant formula up to 1000 mg/L is not of concern. US FDA: food-grade carrageenan is affirmed GRAS and regulated under 21 CFR 172.620 (carrageenan) and 182.7255; specifications restrict low-molecular-weight (degraded) fractions.

Is Carrageenan safe? Any cautions or side effects?

Food-grade carrageenan is poorly absorbed and has been repeatedly judged non-carcinogenic and safe at use levels by JECFA, EFSA, and the FDA. The principal open question is gastrointestinal: animal and cell models show food-grade carrageenan can degrade the colonic mucus barrier, shift microbiota (lowering Akkermansia muciniphila), and activate TLR4/NF-kB inflammatory signaling, and a small double-blind RCT (Bhattacharyya 2017) found a no-carrageenan diet lengthened time to relapse in ulcerative colitis. A 2024 crossover RCT (Naimi, BMC Medicine) found 500 mg/day carrageenan did not change insulin sensitivity overall but increased intestinal permeability and, in overweight participants, lowered insulin sensitivity and raised CRP/IL-6. These trials are small and industry-funded critiques note they used bolus capsules rather than food-bound carrageenan. A crucial distinction: most alarming older data used poligeenan ("degraded carrageenan"), an acid-hydrolyzed low-molecular-weight material never permitted in food and not the same as the food additive. People with active inflammatory bowel disease (Crohn's, ulcerative colitis) who wish to be cautious may reasonably choose to limit it; for the general population the regulatory consensus is reassuring.

How many studies support Carrageenan?

NutriDex cites 9 sources for Carrageenan, graded "Mixed".

Cite this page
APA

Peh, D. (2026). Carrageenan (E407): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 16 Sept 2026, from https://nutridex.info/s/carrageenan

BibTeX
@misc{nutridex_carrageenan,
  author       = {Peh, Daryl},
  title        = {Carrageenan (E407): Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/carrageenan},
  note         = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-09-16}
}

For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.

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