A swipe of lipstick may leave lead on your lips. A 2007 study commissioned by the Campaign for Safe Cosmetics found detectable levels of lead in 20 of the 33 top brand lipsticks tested. Lipstick is often ingested and even trace amounts of lead can build up in the body over time, leading to a host of health problems. Other eco-trouble in the tube: Petroleum-based waxes, synthetic colors and man-made oils. Since you won’t see lead listed on the ingredient list, choose lipsticks labeled “lead-free.”