Collistar cosmetics. PERFECT HAIR. Anti-Hair Loss Revitalizing Vials with Trichogen Veg. Inhibits the enzyme 5-alpha reductase, the main cause of hair loss. Fights atrophy of the follicle and stimulates growth of new hair. Boosts the germinative activity of bulb cells. Prolongs the hair life cycle. Strengthens the peribulbar matrix and improves hair rootage. Reinvigorates the hair fibre. Results: the effectiveness of this treatment has been demostrated by rigorous clinical and instrumental test carried out by the Institute of Skin and Prodict Evaluation (ISPE). Increased resistance of hair to traction: + 60%. Reduction of hair loss: - 31.6%.