The card does not state how often the mask can be used and gives no method of use or warnings. According to the manufacturer's description, this is a shungite-based balm-mask that nourishes the hair and makes it shiny and strong along its entire length; the colour is black and the mask lathers into an abundant white foam. The composition (INCI) is not stated on the card.
General information (not a manufacturer's instruction): if no frequency is stated on the packaging, you can start with infrequent use; in case of itching or irritation of the scalp, stop using it.