A Brazilian blowout creates a protective layer around each strand of hair. It uses a liquid keratin formula. Keratin is a kind of protein naturally found in your hair, skin, fingernails, and even teeth.

Adding more keratin can help strengthen and smooth hair strands. This temporarily makes your hair look fuller and glossier.

This protein is also found in horns, hoofs, claws, feathers, and wool. The keratin used to make Brazilian blowout treatments usually comes from birds and animals.

Other chemicals are also needed to help bond keratin to your hair.