I don't have thick hair, but I like:
Phytospecific Intense Nutrition Mask
Phytospecific Moisturizing Styling Balm
Also fond of the
Phytospecific Intense Nutrition Shampoo
The Phytonectar Shampoo is also pretty good as well as the Phytodefrisant.
Good luck with your choice if you decide to buy something from the line.