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Of the 21 parabens, the four most commonly found in cosmetic and skin-care products are methylparaben, propylparaben, butylparaben and ethylparaben.

Checking the effects of sunscreen on the environment requires getting familiar with chemicals including oxybenzone, octinoxate and methylparaben.

Some hormone disruptors – including methylparaben, which is in concealer and face wipes the ACS is giving to cancer patients – have been shown in a lab to interfere with Tamoxifen, a common hormonal breast cancer treatment.

If the product you are using contains methylparaben, ethylparaben, propylparaben, butylparaben and isobutylparaben, it has parabens.

Parabens are listed on ingredient labels—as methylparaben, propylparaben, or other words ending in -paraben—so it’s easy to choose products that don’t contain them, says Dr. Donofrio, or to limit your exposure by keeping their use to a small amount of skin area.