Why does my hair get frizzy when I use leave-in conditioner?

Hair can become frizzy after using a leave-in conditioner when the product is not fully absorbed into the hair. Ingredients such as silicones or oils may remain on the hair shaft, creating a layer that attracts moisture from the air. This can cause the hair to swell and become frizzy. To help prevent this, choose lightweight formulas containing ingredients such as glycerin or aloe vera.