carrageenan
carrageenan

Carrageenan

Common names: Irish Moss, Kappa Carrageenan, Gelcarin, Viscarin, E407 (European food additive code).
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KIDSADVISORY SAFETY RATING
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Caution
Published by Jordana Tobelem, RD, LDN — Last Updated on Apr 16, 2025
Medically reviewed by Dr. William Lin, MD
Carrageenan is a natural polysaccharide derived from red seaweed and widely used in the food industry as a thickener, stabilizer, and gelling agent. Its unique properties make it ideal for improving the texture and shelf life of products like dairy items, plant-based milk, and processed meats. Carrageenan’s ability to interact with proteins and stabilize emulsions has made it a key ingredient in many low-fat and dairy-alternative foods.[1]
Despite its functionality, carrageenan has faced scrutiny due to studies linking it to gastrointestinal inflammation and other potential health risks. Degraded carrageenan, not approved for food use, is primarily associated with these adverse effects.[2] While food-grade carrageenan remains approved by regulatory agencies, ongoing research and consumer demand for natural alternatives continue to influence its use.[3]

Safety Overview

Regulatory Bodies

FDA (US)
The U.S. Food and Drug Administration (FDA) classifies carrageenan as “generally recognized as safe” (GRAS) for use in food products when used within approved concentrations.[1] However, the FDA has noted concerns about degraded carrageenan, which is not permitted for use in food.[2]
Health Canada
Health Canada permits the use of carrageenan as a food additive in various products, such as dairy and plant-based beverages, with strict quality standards.[4] The regulatory body ensures that only food-grade carrageenan, free from harmful impurities, is approved for consumption.[4]
EFSA (Europe)
EFSA recognizes carrageenan (E407) as safe for food use, with no acceptable daily intake (ADI) established due to its low toxicity.[5] The agency has highlighted that any potential health concerns relate primarily to high doses or degraded carrageenan, which is not present in food-grade forms.[6]
WHO (World Health Organization)
The WHO and FAO consider food-grade carrageenan safe for consumption, noting its widespread use as a thickening and stabilizing agent.[7] The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated it multiple times and found no significant health risks at standard dietary levels.[7]

FDA GRAS

U.S. Food and Drug Administration – Generally Recognized as Safe (GRAS)
Current Status
Classified

EWG Rating

Environmental Working Group
  • EWG Rating: Carrageenan has an EWG rating of 4-5, indicating moderate concern for potential health impacts depending on its use in food or personal care products.[8][9]
  • Level of Caution: The Environmental Working Group (EWG) recommends caution with carrageenan due to studies suggesting its potential to cause gastrointestinal inflammation.[8]
  • Possible Health Risks: Carrageenan has been associated with gut irritation and inflammation, particularly in individuals with pre-existing gastrointestinal conditions.[8]
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More about Carrageenan

  • Dairy Products: Yogurt, ice cream, cream cheese
  • Beverages: Plant-based milk, chocolate milk, fruit drinks
  • Processed Meats: Sausages, deli meats, canned meats

Historical Use
Carrageenan has been used for centuries, originating in Ireland where red seaweed was boiled to create thickened foods and beverages.[6] Its industrial use began in the 20th century when its unique gelling and stabilizing properties were harnessed for food and pharmaceutical applications.[6]
Current Exposure
Today, carrageenan is widely used in processed foods such as dairy products, plant-based milk, and meat products, as well as in personal care items like toothpaste and lotions.[1] Consumers are frequently exposed to it due to its prevalence in common household products, often under regulated concentrations.[1]

Gastrointestinal Inflammation
Research suggests that carrageenan may contribute to inflammation in the gastrointestinal tract, particularly in individuals with pre-existing conditions like ulcerative colitis.[2] Degraded carrageenan, not used in food, has been shown to cause more severe inflammatory effects.[3]
Immune System Activation
Studies indicate that carrageenan can stimulate an immune response, potentially leading to increased production of pro-inflammatory cytokines.[3] This response may exacerbate symptoms in individuals with inflammatory bowel diseases.[5]
Potential Allergic Reactions
Rare cases of skin irritation and allergic contact dermatitis have been reported due to exposure to carrageenan in personal care products.[10] These reactions are typically mild but may affect sensitive individuals.[10]
Possible Tumorigenic Effects
Animal studies have linked high doses of degraded carrageenan to the development of tumors in the colon, although this does not apply to food-grade carrageenan.[6] This finding has prompted caution and further evaluation of its long-term safety.[6]

Toxicological Studies
Toxicological research shows that food-grade carrageenan is generally safe at typical dietary levels; however, degraded carrageenan (not permitted in food) has been linked to severe gastrointestinal inflammation in animal studies.[2] Experimental studies have indicated that high doses of carrageenan may increase the risk of gut epithelial damage and immune activation.[3]
Long-Term Safety
Long-term consumption of food-grade carrageenan at normal dietary levels has not been conclusively linked to significant health risks, though individuals with pre-existing gastrointestinal conditions may experience heightened sensitivity.[2] Prolonged exposure to degraded carrageenan has been associated with tumorigenic effects in animal models, prompting caution in evaluating its safety.[6]

High-Risk Groups
Individuals with pre-existing gastrointestinal conditions, such as irritable bowel syndrome (IBS) or ulcerative colitis, are particularly sensitive to carrageenan’s potential inflammatory effects.[2] Pregnant women and young children may also be considered high-risk due to their physiological vulnerability and dietary habits.[3]
Health Impacts
In vulnerable populations, carrageenan has been linked to exacerbation of gastrointestinal symptoms, including increased inflammation and discomfort.[3] Studies suggest that carrageenan may induce immune system activation, which can worsen underlying inflammatory conditions in these groups.[6]

Recommended Intake
Regulatory agencies, including the Joint FAO/WHO Expert Committee on Food Additives (JECFA), have not established a specific acceptable daily intake (ADI) for food-grade carrageenan, deeming it generally safe at typical consumption levels.[7] However, they recommend its use within approved concentrations to avoid adverse effects.[1]

General Safety Level
Carrageenan is generally recognized as safe (GRAS) by regulatory agencies such as the U.S. Food and Drug Administration when used as a food additive within approved concentrations.[1] However, degraded carrageenan (not used in food) has been linked to gastrointestinal inflammation in animal studies.[2]
Sensitive Individuals
People with pre-existing gastrointestinal conditions, such as irritable bowel syndrome (IBS), may experience exacerbated symptoms due to carrageenan’s potential inflammatory effects.[3] Rare cases of allergic skin reactions have also been reported in sensitive individuals exposed to carrageenan.[10]

FAQ

What is carrageenan?

Carrageenan is a natural thickener and stabilizer derived from red seaweed, commonly used in food products.

Is carrageenan bad for you?

Carrageenan is generally considered safe, but some studies suggest it may cause digestive issues or inflammation in sensitive individuals.

References

  1. US Food and Drug Administration FDA 2024 Substances Added to Food formerly EAFUS Carrageenan Available at: https://www.hfpappexternal.fda.gov/scripts/fdcc/index.cfm?set=FoodSubstances&id=CARRAGEENAN&sort=Sortterm_ID&order=ASC&startrow=1&type=basic&search=carrageenan ↩︎
  2. Tobacman JK 2001 Review of Harmful Gastrointestinal Effects of Carrageenan in Animal Experiments Environmental Health Perspectives 109(10) 983-994 Available at: https://pubmed.ncbi.nlm.nih.gov/11675262/ ↩︎
  3. McHugh DJ 2003 A guide to the seaweed industry FAO Fisheries Technical Paper 441 Available at: http://www.fao.org/3/y4765e/y4765e.pdf ↩︎
  4. Health Canada 2024 List of Permitted Emulsifying Gelling Stabilizing or Thickening Agents Lists of Permitted Food Additives Available at: https://www.canada.ca/en/health-canada/services/food-nutrition/food-safety/food-additives/lists-permitted/4-emulsifying-gelling-stabilizing-thickening-agents.html ↩︎
  5. European Food Safety Authority EFSA 2018 Re-evaluation of carrageenan E 407 and processed Eucheuma seaweed E 407a as food additives EFSA Journal 16(4) e05238 Available at: https://efsa.onlinelibrary.wiley.com/doi/10.2903/j.efsa.2018.5238 ↩︎
  6. Campo VL et al. 2009 Carrageenans Biological Properties Chemical Modifications and Structural Analysis Carbohydrate Polymers 77(2) 167-180 Available at: https://www.sciencedirect.com/science/article/abs/pii/S0144861709000459 ↩︎
  7. Joint FAO WHO Expert Committee on Food Additives JECFA 2007 Evaluation of Certain Food Additives and Contaminants Carrageenan WHO Technical Report Series 947 Available at: https://openknowledge.fao.org/server/api/core/bitstreams/8d0cdb62-6b9c-41d5-8b6d-c80572bc3248/content ↩︎
  8. Environmental Working Group EWG n.d. Chondrus Crispus Carrageenan Available at: https://www.ewg.org/skindeep/ingredients/701131-CHONDRUS_CRISPUS_CARRAGEENAN. ↩︎
  9. Environmental Working Group EWG n.d. Carrageenan Available at: https://www.ewg.org/foodscores/ingredients/7365-Carrageenan. ↩︎
  10. Necas J Bartosikova L 2013 Carrageenan a review Veterinarni Medicina 58(4) 187-205 Available at: https://www.agriculturejournals.cz/pdfs/vet/2013/04/01.pdf ↩︎

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