Our multidisciplinary team of biologists, pharmacists and hairdressers, with extensive experience in the field of Hair Cosmetics carry out studies to evaluate the effectiveness of active ingredients and finished products


Sensory evaluation studies are used to measure, analyse and interpret different properties of products which are perceived though the senses.


To select participants in studies of effectiveness, Zurko-CTC possesses an extensive database with more than 2000 volunteers classified according to their hair characteristics and various problems:


  • Hair of all origins: Mediterranean, Nordic, Afro, Asian, Brazilian, etc.

  • Hair of different characteristics: straight, thick, bleached, etc.

  • Different scalp disorders to assess treatment products

  • Determination together with the customer of the inclusion and exclusion criteria for the volunteers

  • Regular monitoring of volunteers throughout the experiment.

  • After the first uses of the product, a control is carried out in order to detect any problems or undesirable reactions.Zurko

Volunteers are selected in accordance with the aims of the study.

Zurko-CTC’s facilities include insulated booths for assessing products. Assessment booths feature controlled light, temperature and humidity conditions to ensure optimum working conditions.

  • Recruitment according to the requirements of the project.

  • Panelists in reserve in case of dismissal or abandonment.

  • Selection based on the inclusion / exclusion criteria established with the client.

  • Signature of consent, written instructions and delivery of the product to be applied.

  • Regular follow-up during the trial through messaging, SMS, random visits, phone calls.

  • Evaluation controls.

  • Monitoring and control to identify possible problems or reactions.


  • Half Tests

  • Strands of human hair

  • Quantitative descriptive studies carried out by a panel of experts

  • Salon test, carried out by hairdressers

  • Consumer test

  • Affective or preference test


  • As a complement to instrumental methods: the correlation between physical-chemical parameters and sensory responses

  • Effectiveness of active substances

  • Effectiveness of preparations: conditioners (with and without rinsing), masks, serum, volumisers, fixers, re-structuring, etc.

  • Modification of formulations

  • Development of new products

  • Marketing arguments and claims

  • Cost optimisation

  • Tests of stability over time

  • Quality control

  • Check on competition