Loom bands, a popular fashion accessory, may contain cancer-causing chemicals and toxins at levels 500 times the legal limit. Research has found that many imported loom band products contain phthalates, which are suspected carcinogens. While loom bands look gorgeous, this document warns people to be careful using them as they can pose health risks if one's mouth contacts them or they are worn too tightly, and children should avoid using them altogether to prevent swallowing small pieces.