I recommend this hair serum.

I started using this because a hair salon I know gave it to me when they closed down... and it’s really good. I trusted it a bit more since they use it in a salon, but anyway! I apply a generous amount of the serum to my hair while it's still wet right after washing it, then comb it while drying, and my hair feels incredibly bouncy and smooth. The scent is subtly fragrant and is a fragrance that most people wouldn't dislike. It's also great because it's hardly sticky, and the quantity is generous.