What is the rarest hair type? Check out these quick facts about type 1A hair, known for its straight, light strands. Find out ...

With that in mind, we put the collection to the test on four Byrdie staffers with different hair types. Read on for all the details and our honest reviews. “Hair has always been personal to me ...

And while I’ve written stories about the best shampoos for those different hair types — from fine to color-treated — here, I’ve thought about the best shampoos for any type of hair.

The balance between these types of melanin is regulated by more than 100 genes. How hair color varies in different body regions will depend on how these genes are expressed. The activity of ...