Carrageenan

Carrageenan (E407) is a family of linear sulphated polysaccharides extracted from red seaweeds of the Rhodophyta class, principally Chondrus crispus, Eucheuma, and Kappaphycus species. Three main forms are distinguished by their sulphation pattern and gelling character: kappa-carrageenan (firm, brittle gels with potassium ions), iota-carrageenan (soft, elastic gels with calcium ions), and lambda-carrageenan (non-gelling thickener). In food manufacturing, carrageenan is used as a gelling agent, thickener, and stabiliser in dairy desserts, processed cheese, infant formula, deli meats (as a water binder), and chocolate milk (where it prevents cocoa particle sedimentation through weak-gel network formation).

JECFA has assigned carrageenan a not-specified ADI, based on extensive safety studies establishing the absence of genotoxicity, carcinogenicity, or organ toxicity at normal food additive exposure levels (evaluated 2014 by the 79th JECFA meeting). The toxicological history of carrageenan is complex: degraded carrageenan (poligeenan, produced by acid hydrolysis to molecular weights below 20,000 Da) causes intestinal ulceration in animal models and was investigated as a potential pharmaceutical inflammatory agent. Native food-grade carrageenan (molecular weight 200,000–800,000 Da) is clearly distinct, but critics have argued that acidic gastric conditions may generate some degraded fragments in vivo. JECFA's 2014 review examined this mechanism and concluded that evidence does not support carcinogenicity or inflammatory activity from food-grade carrageenan at achievable dietary exposures.

Carrageenan is authorised under EU Regulation (EC) No 1333/2008 with restrictions in infant formula — only processed cereal-based foods and foods for special medical purposes may contain carrageenan for infants (maximum 1 g/L). It holds GRAS status in the United States under FDA 21 CFR §172.620. The Codex Alimentarius Commission permits carrageenan at quantum satis in most food categories. It is absent from organic certification schemes in the EU but permitted under USDA NOP organic regulations, a divergence that has generated labelling debate in the natural products industry. Given ongoing scientific debate, some manufacturers have proactively reformulated infant formula to remove carrageenan despite regulatory approval.