The FDA works to ensure that cosmetic companies follow regulations to keep cosmetics and personal care products as safe as possible. But although the FDA recommends that cosmetic manufacturers test their products, they aren't required to do so. You can tell what's been tested by looking for a product label that says: “WARNING. The safety of this product has not been determined.” If a product hasn't been tested for safety, it must display that labeling.
You may also see labels that say external D&C, D&C, or FD&C, followed by the name of a color. For instance, you might see this on a label: D&C Red No. 36. These are color additives. External D&C is approved only for use in cosmetics and in medicines that are applied to the skin. D&C color is approved only for use in medicines and cosmetics. But FD&C color is approved for use in foods, medicines, and cosmetics.
Two commonly used chemicals that have been studied for safety issues are parabens and phthalates. Parabens are preservatives that prevent the growth of bacteria and mold in personal care products and cosmetics. One study suggested a possible link between parabens and breast cancer. But other studies have not reached the same conclusion. The levels of parabens used in personal care products today are considered safe. But parabens (and other ingredients) may cause irritation or an allergic reaction in some people.
Phthalates are used to enhance the formulas of a range of cosmetics and personal care products, from shampoo to hair spray to nail polish. They may be used as solvents and perfume fixatives. They are also used to help prevent stiffness in hair spray and reduce cracking in nail polish. Phthalates are still being researched to determine their safety.