The cleanse itself is usually hard on hair during the cleanse. (I should say sometimes).
My recommendation for thickening up the hair is a water called "Silver Wain Water"
You can Google it.
I guarantee your hair will get better with it. (I shouldn't make that claim, but I just did)
And I have no interest in the product being promoted. I have no connection to its sellers or manufacturers. I just know that my hair has gotten thicker and healthier by using it.
Get your hair thicker then you'le be fine doing a cleanse.