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DEA/TEA/MEA: These are commonly used as emulsifiers or foaming agents in soaps, body washes, and shampoos. They are suspected carcinogens. -
Coal Tar: This is another carcinogen and is banned in the EU. It is commonly found in anti-dandruff and anti-lice shampoos as well as in dry skin treatments. It is usually sneaked into products under the label FD&C Red No. 6. -
Hydroquinone: This is typically found in whitening solutions and is thought to cause reproductive anomalies. It is banned in the U.K. -
Formaldehyde: Another carcinogen suspect, it is commonly found in nail products, shampoos, fake eyelash adhesives, and hair color. It is banned in the EU. -
Mercury: Mercury is linked to degenerative effects on brain development. You typically find it in mascara.