I have received a lot of compliments on my hair during my lives!
You asked and here is one of the reasons why my hair is so shiny!
My conditioner contains a polyquaternium. Quat. 7 to be exact. It helps detangle and add shine!
You can read about various polyquats on this blog.
I specifically picked Quat 7 b/c that's what the formulator was using and it was readily available at one of my suppliers.