Alpecin Doppel Effekt Shampoo's key ingredients are a Caffeine Complex, Salicylic Acid, and Piroctone Olamine,
working to fight dandruff (Salicylic Acid & Piroctone Olamine) and
activate hair roots (Caffeine) to combat hereditary hair loss, alongside
nourishing elements like Panthenol, Hydrolyzed Wheat Protein, Niacinamide, and Zinc PCA.Key Active Ingredients & Their Roles:

• Caffeine Complex:
  Penetrates hair roots quickly (within 120 seconds) to activate them,
  strengthen them, and protect against premature inactivity, a cause of
  hair loss.
• Salicylic Acid: Gently removes dandruff flakes and soothes the itchy scalp through a micro-peeling effect.
• Piroctone Olamine: An anti-fungal agent that prevents new dandruff from forming by targeting the yeast fungus. 

Other Important Ingredients:

• Panthenol (Pro-Vitamin B5): Moisturizes and nourishes the hair and scalp.
• Hydrolyzed Wheat Protein: Helps strengthen hair strands.
• Niacinamide (Vitamin B3) & Zinc PCA: Support energy metabolism and nutrient supply to the hair roots.
• Menthol: Provides a refreshing, cooling sensation on the scalp. 

Base Ingredients:

• Aqua (Water), Sodium Laureth Sulfate, Laureth-2, Disodium Laureth Sulfosuccinate, Sodium Lauroyl Glutamate: These are surfactants (cleansing agents) that create foam and clean the hair and scalp. 

This
combination provides a dual-action formula, tackling dandruff while
simultaneously stimulating hair roots for stronger growth.