Both treatments eliminate frizz. A Brasilian blowout and a keratin treatment are both hair-smoothing treatments. They start to differ depending on which brand you choose. But while both treatments calm frizz and smooth strands, there is a difference when it comes to intensity.
Brazilians also leave your natural texture (curl or wave) in with just removing frizz. With keratin, (the treatment is) heavier, taking away more volume and frizz, and calming the curl more.
Both treatments can, but do not always contain formaldehyde, so it’s important to ask your stylist about the brand and ingredients to make sure it is the right one for you and achieves the hair goal that you have.