Remember Lily Tomlin playing Edith, when she was going through the lady’s purse? “Lipstick. Is that lipstick? You do not need lipstick. You could just take a red jelly bean and wet it. And it don’t cost a dollar.” (That was about the price of mid range lipstick back then.)
Don’t recall her skit but lead in lipstick just doesn’t seem like one of those major problems of the world at a few parts per billion.
To put perspective on a billion: Seven or eight times around the earth would be near a billion feet.