Degraded Carrageenan (Low-Molecular-Weight Fragments)

Last reviewed October 19, 2026

In plain words: Degraded carrageenan (low-molecular-weight carrageenan) is made of much smaller fragments than the carrageenan used in food. It is not the same as food-grade carrageenan (E 407). For the food additive, see our carrageenan guide.

Published research: what individual studies found

These are findings from individual published studies and food-safety agency opinions, credited to each paper. Each one is labeled by type of evidence. They do not change any verdict, evidence grade or score on this site.

Evidence type: Animal + lab study

• In germ-free mice, small fragments of kappa-carrageenan, together with bacteria that break them down, promoted inflammation. In the same study, human gut bacteria did not break down the larger carrageenan used as a food additive. This is about degraded fragments, not food-grade carrageenan (E 407), and hasn't been shown in people.
• Source: Yin Y et al., J Genet Genomics, 2021 · doi:10.1016/j.jgg.2021.08.001

For information only, not medical advice. Studies are cited to their authors' published papers; the researchers aren't affiliated with and don't endorse Let Me Scan That or any product. A study link doesn't mean an ingredient causes harm. Report an error

Related guides

• Carrageenan
• Emulsifiers, Gums and Thickeners: What Families Should Know

This page is for general education. It is not medical advice and does not replace advice from your doctor, pediatrician, allergist or registered dietitian. Research changes; we review these pages when new evidence or rules come out. Last reviewed October 19, 2026.