Studies have linked hair coloring with certain cancers. Hair colorings made from coal-tar were given special exemption from bans when the Food, Drug and Cosmetic Act was passed in 1938. The FDA can't order these removed even if they are proven harmful. May contain dioxane, a potential cancer-causing agent, estrogen mimic, and endocrine disrupter. Mixed with animal fat in soaps.
Serious burns result if contact is made with skin before it is diluted.
Very drying to skin and bar soap breeds germs. Shown to cause dermatitis, kidney and liver abnormalities in animal studies. May inhibit skin cell growth and be irritating to the skin. Builds up in the heart, liver, lungs, and brain. Could retard healing, cause cataracts, roughen skin, and lead to improper eye development in children under 6 years.