The card does not speak about dehydrated skin or a mix of skin types: it describes the clay as a care product for oily skin that is suitable for the face and body. Warnings: do not use if you are hypersensitive to the ingredients; if allergic reactions occur, stop using it and consult a doctor.
General information (not a manufacturer's instruction): clay can dry the skin; if the skin is dehydrated, first test the reaction on a small area.