The Common Skin-Care Ingredient You Should Probably Avoid, According to Jennifer Lawrence's Facialist

Two of the biggest beauty terms right now are “mineral” (think flawless-coverage mineral makeup, mineral-rich thermal water) and “oil” (as in face oil, hair oil, body oil, sunscreen oil…). Does that make mineral oil a beauty no-brainer? Not exactly. Plenty of classic beauty products feature mineral oil for its hydrating properties, but there are also dozens of brands that emphatically call out their avoidance of the ingredient (along with other established beauty "bad" words, such as parabens, phthalates, PABA, artificial colors, artificial fragrances, and all those other things we're all supposed to be avoiding) right there on the packaging. So what is mineral oil, exactly—friend or foe? Classic skin-care staple, or major no-no?