The side effects that are caused by carrageenan to the body are, Inflammation, Intolerance to Glucose, food allergies, colon cancer, Irritable Bowel Syndrome and even bloating.
Although not everyone gets these side effects from carrageenan but it can affect some people more than others and some people are never affected by it.
Carrageenan is pretty safe to be consumed and is used in infant formula as well.