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This review covers the basic principles of forensic hair analysis, including how chemical substances get incorporated into hair, and emphasizes its applications in disease diagnosis, without providing new experimental results.

This study found that permanent waving treatment induces structural changes in the cortex proteins of white human hair, significantly reducing its tensile strength without altering the S-S band intensity.

This study found that hydrophobic amino acids from egg white hydrolyzed protein and L-phenylalanine effectively penetrate deep into the human hair fiber, increasing specific contents in both virgin and bleached hair.

This study measured heavy metal concentrations in Hibiscus rosa-sinensis, Eclipta alba, and Solanum nigrum, finding that levels for Cu, Cr, Cd, Hg, As, and Pb were within WHO safe limits, suggesting these medicinal plant extracts are free from heavy metal toxicity concerns.

In this study, chemical treatments during permanent hair straightening were found to randomize proteins in the cortex, aiding in the reconnection of disulfide bonds during oxidation.