Feed your hair.
See Ouidad website (I'm new I don't know if we can "promote" a website or product. I don't work for them. LOL)
Their product line is entirely for curly hair. That's all they do. You answer some questions about your type of curls (thin, thick, frizzy, etc), and they recommend products.
It's not a gimmick.
It's the only product that has ever worked on my fine curly hair.