Does anyone here use serums?

I have been experimenting with Fantasia Frizz Buster Serum after CWC with Garnier Fructis Triple Nutrition Shampoo and conditioner and my hair comes out pretty frizz free yet fluffy/voluminous. It also works well for me with Dove Shampoo and GVP Paul Mitchell the Detangler.
2a/M-C/ii hair. Super long.