Comparative efficacy and safety of platelet-rich plasma (PRP), injectable platelet-rich fibrin (i-PRF) and concentrated growth factors (CGF) for female pattern hair loss (FPHL): a prospective multicenter randomized clinical trial

BACKGROUND: Comparative studies among different autologous platelet concentrate types for FPHL remain lacking. METHODS: Patients with FPHL (Sinclair gradeII-III) were enrolled and randomized to receive 4 sessions of PRP, i-PRF or CGF treatment at 4-week intervals. The primary endpoint was the inter-group comparison of the non-vellus target area hair count (TAHC)-increase (%) at 24 weeks. Secondary endpoints included: within-group changes in TAHC from baseline; within-group changes in hair diameter (HD) from baseline and inter-group comparison of HD-increase (%) at 24 weeks; Growth factor concentrations were quantified to explore correlations with efficacy. CONCLUSIONS: CGF and i-PRF demonstrated superior efficacy in increasing TAHC in FPHL patients. The i-PRF group had the lowest adverse event rate. VEGF levels may play a potential role in promoting hair growth.