CONFLICT OF INTEREST STATEMENT The authors declare no conflict of interest. REFERENCES 1. Chemical and physical behavior of human hair. 4th ed. New York: Springer-Verlag; 2002. 2, , , . Analysis of hair lipids and tensile properties as a function of distance from scalp. Int J Cosmet Sci. 2005; 27: 193–197. 3, , , , , , et al. Improving the mechanical properties of damaged hair using low-molecular weight hyaluronate. Molecules. 2022; 27(22): 7701. 4, , , , .