Don't use henna, so can't answer that one. This is a great easy protein treatment.

It reduces frizz--because of the protein. I've stopped using it because I didn't care for the smell. It stayed in my hair all day. I went back to my Nexxus products.
3a (Corkicelli), highlighted, fine, low porosity

HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic; Botanical Spirits Jellies, CJ Repair Me, Aloe Fix