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Carrageenan: Food Additive or Health Concern? A Comprehensive Review
Sedat Arslan1, Merve Kiyar2, İpek Akyüz2
1Department of Nutrition and Dietetics, Bursa Uludag University, Bursa, Turkey, sedatarslan@uludag.edu.tr.
Annals of Nutrition & Metabolism
|August 6, 2026
Summary
Carrageenan, a seaweed extract, has conflicting health effects. Its benefits or harms depend on type, dose, and individual factors, requiring more research for safety guidelines.
Area of Science:
- Food science
- Pharmacology
- Nutrition science
Background:
- Carrageenan is a sulfated polysaccharide from red seaweed.
- It is utilized globally in food, pharmaceuticals, and cosmetics for its functional properties.
- Its prevalence in Western diets prompts investigation into health impacts.
Purpose of the Study:
- To review the contradictory scientific evidence on carrageenan's health effects.
- To explore factors influencing carrageenan's biological activity.
- To assess current regulatory stances and identify research gaps.
Main Methods:
- Literature review of existing studies on carrageenan.
- Analysis of contradictory findings regarding health benefits and adverse outcomes.
- Examination of regulatory assessments by bodies like the FDA and EFSA.
Main Results:
- Evidence is mixed, with reported antioxidant, antiviral, antitumor, and immunomodulatory benefits.
- Potential adverse effects include impaired glucose metabolism, intestinal inflammation, and immune dysregulation.
- Effects are contingent on carrageenan type, molecular weight, purity, dosage, and host factors.
Conclusions:
- Carrageenan's effects are context-specific, not uniformly beneficial or harmful.
- Further research is essential to understand dose-response relationships and safety in vulnerable groups.
- Clarification is needed for industry and public health nutrition guidelines.
