Abstract
In this study, the values of some scalp basal parameters, collected during several clinical studies involving a total of 254 subjects with androgenic alopecia, were analyzed. Subjects’ values were grouped by age and gender, and the differences between groups were examined. The density values (n° of hair/cm2) and the percentages of anagen and telogen hair were considered. Furthermore, the variations recorded at the end of cosmetic treatments (ranging from 12 to 16 weeks) aiming to reduce excessive hair loss were analyzed. The basal values regarding the percentage of hair in the anagen phase evidenced a linear decrease with increasing age, with a corresponding increase of the percentage of hair in the telogen phase. As far as the hair density differences between males and females are concerned, females had a mean value significantly higher than males. Moreover, at the end of the intended anti-hair loss treatments, females were more susceptible to improvements of their hair density values.
Highlights
The premature hair loss associated with androgenic alopecia is a deeply felt problem
Data of clinical studies, performed in Italy, of different anti-hair loss treatments related to 254 subjects with androgenic alopecia, measured over a period of 5 years, were collected and compared
The basal values of the percentage of hair in the anagen phase evidenced a linear decrease with the increase of age, with a corresponding increase in the percentage of hair in the telogen phase
Summary
The premature hair loss associated with androgenic alopecia is a deeply felt problem. The cosmetic industry is struggling to cope with the quest for scalp treatments by means of products (lotions, shampoos, conditioners and diet supplements) aiming to decrease or prevent excessive hair loss. In order to satisfy the growing expectations of consumers, very high product performances are necessary. For this reason, it is essential to perform accurate efficacy evaluations before launching a new functional product on the market [2]. By means of subjective tests, like self-assessment questionnaires, it is possible to learn the perception of consumers both of the anti-hair loss, strengthening, and reinvigorating effects, and on the sensorial appreciation for fragrance pleasantness and ease of application
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