Since the early 2000s, researchers have noticed a troubling new trend in female development: Girls are entering puberty — developing breasts, pubic hair and getting their period — at younger ages.
So, what’s driving the trend? Some researchers have long suspected that hormone-manipulating chemicals are the culprit. But these chemicals aren’t necessarily coming from contaminated water or dangerous environments. Instead, they’re found in products we use every day, including shampoo, makeup and nearly every kind of toiletry.