Unfortunately, the non-dairy soy milk option isn’t healthy either. It contains carrageenan, a popular stabilizer that may increase the risk of cancer and cause inflammation of the intestines. More than 100 scientific studies have proven the dangers of soy, even organic soy milk. It causes inflammation which may lead to bleeding and ulcerations, according to veteran carrageenan researcher Joanne Tobacman, MD, associate professor of clinical medicine at the University of Illinois School of Medicine at Chicago. Carrageenan has been linked to a number of different serious conditions, including colon cancer, ulcerative colitis, and intestinal lesions.