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This study discovered previously unknown structures in human hair shafts that may stabilize hair structurally and physicochemically.

This study found that using near-infrared optics, specifically in the second NIR window, allows for effective noninvasive evaluation of intra-hair damage caused by cosmetic treatments, demonstrating distinct damage types and changes in hair condition due to chemical or thermal processes.

This study used ultrahigh-resolution optical coherence tomography to observe hair shaft structures, finding melanin granules absent only in white hair, which may explain color differences between black and white hair.

This study highlights confocal microscopy as a promising, minimally invasive tool for assessing hair morphology and internal structures, making it valuable for cosmetic hair assessments.

This study found that optical coherence tomography provides highly reproducible and less variable measurements of hair shaft thickness compared to standard light microscopy, offering a promising noninvasive tool for clinical practice.