So far i can see only one recommendation so you have nothing to be confuse about.
I tell you what i do, you can try it and see if it works for you 2.
I use Nizoral once or twice a week, And 3 times a week i use Revivogen shampoo. Nizoral is the only shampo that has proves for its anti dht effect.
And for the Revivogen, my hair looked thicker right after the first time i used it.
I also use the serum but my hair looks thicker even in the places i don't use the serum.
By the way, since i use revivogen i notice more gray hair, but i dont know if there is any connection.