When it comes to hair care, most people focus on how shiny or soft their hair looks—but experts are now warning that some everyday shampoo ingredients could be harming your hair from the inside out.

Alison Richards first noticed her long, blond hair began to thin and then fall out in her 20s. "There was one day in the shower where I just had hundreds of strands of hair, like fistfuls of hair ...

I discovered I was experiencing hair thinning in the most unexpected (and sort of embarrassing) way. During a visit home to see my folks, I bent down to grab a piece of mail my mom dropped. I heard ...