Salicylic acid provides antimicrobial action, prevents the formation of new dandruff on the scalp and gently removes the top dandruff layer. octopirox provides antimicrobial action and prevents the formation of new dandruff on the scalp. the caffeine complex activates the hair roots, extends the hair growth phases and improves hair growth. why double effect?the two most frequent scalp problems affect men: hair loss and dandruff.