The L'Oréal Professionnel Série Expert Scalp Advanced is a range of professional shampoos, conditioners, and treatments designed to address various scalp issues. The specific "Loreal Shampoo Serie Expert Scalp Advanced 300ML" you are asking about usually refers to one of the following main products in the 300ml size:

Scalp Advanced Anti-Dandruff Dermo-Clarifier Shampoo (300ml):

Target Concern: Dandruff (both dry and oily flakes) and a clarifying cleanse.

Key Ingredient: Piroctone Olamine, a powerful antibacterial and antifungal active ingredient.

Benefits: Gently clarifies and effectively removes up to 100% of visible dandruff from the first application, while calming and soothing the scalp. Provides up to 72 hours of dandruff protection.