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Hair loss is a topic that has us very aware of how many hairs we fall and how to avoid it. We can prevent any type of fall or act on early stages of a process of falling to improve the condition of the hair, to promote the growth of healthier, stronger hair or contribute to prolonging the life cycle of hair. Objective: To design and develop Shampoo containing the alcoholic extract of Urtica urens L. Design: Analytical, experimental and comparative study. Location: College of Pharmacy and Biochemistry, National University of San Marcos, Lima, Peru. Methods: plant leaves. White rabbits, New Zealand breed males (irritation test for biological evaluation of medical devices). They formed part of this study diagnosed with hair loss of non-pathological origin, numbering 10 people were evaluated by a medical professional, for 21 days. Microscopic observation underwent the fallen hair daily to assess whether there is increased hair diameter compared to the beginning and end of the study. Fallen hair count per day throughout the treatment was obtained. Using the method of standardized hair count by 60 seconds. Results: the percentage reduction in hair loss was 56.8% for the group of people who used the shampoo at a concentration of 2% and 32.1% for the group of people who used the shampoo at a concentration 5 %. Average diameter of fallen hairs counting and evaluation fallen hairs per day were compared, using the method of standard hair count for 60 seconds. Conclusions: it was possible to design and formulate a shampoo containing alcoholic extract of Urtica urens L. ; proving its effectiveness in treating hair loss improves achieving greater than 50% and also determined not produce skin irritability.  Keywords: Hair Shampoo, alcoholic extract of Urtica urens L., standard hair count by 60 seconds.

DISEÑO Y FORMULACIÓN DE UN CHAMPÚ A BASE DE EXTRACTO ALCOHÓLICO DE Urtica urens L. PARA SU APLICACIÓN CONTRA LA CAÍDA DEL CABELLO