I have naturally curly hair, and I feel that Revivogen shampoo and conditioner do thicken my hair up pretty nicely. These products may also help out a bit with irritation, though in my experience, not as much as Nizoral. If you are using topical hairloss treatments, like Revivogen or spironolactone, then the menthol used in these products could be beneficial for helping with penetration. Overall, I love both the Revivogen shampoo and conditioner. I ended up liking the conditioner more than I expected, and I had to chose one or the other, I'd probably use the conditioner.