Is Carrageenan safe to consume?
A: Yes, we have done extensive research, and this has led us to conclude that food-grade carrageenan is safe to eat. As suggested by Tobacman and Cornucopia, extensive research has shown no correlation between carrageenan and the claims of carrageenan being dangerous. Instead, reliable science continues to demonstrate that ingested carrageenan poses no threat whatsoever. To give the story a little bit of background as to where this all started.
In June 2008, Joanne K. Tobacman, MD, an associate professor in the department of medicine at The University of Illinois at Chicago, filed a citizen petition with the FDA to ban carrageenan. In her petition, Tobacman cited several studies she co-authored that found harmful effects associated with the additive. The studies used amounts of food-grade carrageenan that are lower than those ingested in the typical American diet. In each study, the food-grade carrageenan caused inflammation.
Equally respected scientists have detailed the reasons that this evidence is flawed and misleading, concluding that there is no valid reason to ban its use.