Over the past few weeks, you may have heard about the class action lawsuits filed against Tresemmé for its shampoo containing formaldehyde-releasing preservative DMDM hydantoin allegedly causing hair loss. Switching to products without formaldehyde is a great start, but it's not the only ingredient worth paying attention to in your beauty products. Another big category is phthalates, which are hormone-disrupting ingredients that can be included in beauty products under the label of "fragrance"—and which can have significant health repercussions.