Title : Assessing efficacy and safety of hair growth products in a clinical design using qualitative and quantitative techniques
Abstract:
Hair thinning and alopecia affect a substantial proportion of both men and women and are associated with diminished self-esteem and quality of life. Although pharmacological treatments such as minoxidil and finasteride are approved for androgenetic alopecia, limitations in efficacy, tolerability, and long-term adherence have driven increasing demand for alternative or adjunctive interventions. The rapid expansion of cosmetic and cosmeceutical hair growth products necessitates robust clinical methodologies capable of objectively substantiating efficacy and safety claims.
Our clinical study proposes and evaluates an integrated clinical framework combining qualitative expert assessment with quantitative instrumental measurements to assess hair and scalp outcomes. The primary hypothesis was that a natural topical formulation would significantly improve objective markers of hair density and scalp condition compared with baseline. Secondary endpoints included improvements in hair shaft diameter, scalp hydration, transepidermal water loss (TEWL), and structural hair fibre integrity.
Clinical endpoints were assessed using blinded expert grading and instrumental techniques, including Corneometry and Tewametry (Courage + Khazaka, Germany) for scalp hydration and barrier function, AI-assisted trichoscopic imaging (HairMetrix – VISIOMED D-200EVO, Canfield Scientific, USA) for quantification of hair density and shaft diameter, and scanning electron microscopy (Thermo Scientific Axia Chemi SEM) for ultrastructural evaluation of fibre morphology. Safety endpoints included monitoring of adverse events and scalp tolerability assessments throughout the study period.
The integrated methodology demonstrated statistically and clinically meaningful improvements in predefined endpoints, supporting the utility of multimodal instrumental assessment in hair growth research. These findings suggest that well-characterised natural formulations, when evaluated using validated clinical technologies, may provide measurable benefits and represent viable complementary approaches within the evolving therapeutic landscape of hair loss management.
