Hair loss isn’t something that you typically start to notice overnight. More often, it begins with the widening of your part line, or a patch of hair that’s looking a bit thinner than it used to be.

Patchy, bare scalps may be more about what's in your body than on top of your head.

Hair loss can be a real shocker. One day you’re brushing your hair and it behaves, the next day your brush looks like it’s been through a tornado. While losing a few strands here and there is totally ...