The Simply Zen Double Action Leave In Scalp Treatment Serum set includes 12 vials of 5 ml, designed to strengthen the density and vitality of the scalp. The innovative formula works deeply, stimulating natural hair growth and improving overall health. Easy to apply without rinsing, it provides a una feeling of freshness and well-being, ideal for those who desire a balanced scalp and visibly more voluminous and rejuvenated hair. Una an effective solution for una healthy and vigorous hair.