Influence of Amino Acids on Hair Structure Before and During Chemical Treatments

The study explores the role of amino acids in protecting hair structure during chemical treatments, highlighting the benefits of using free L-amino acids like arginine and cysteine with controlled heating at 50°C. This combination enhances penetration into the hair cortex and offers protection against oxidizing agents, preserving over 80% of the hair's initial strength. The method restores mechanical properties close to their original state, maintaining up to 88% of the hair's strength and reducing brittleness by over 70%. The protective effects are due to additional interactions within the hair matrix and the restoration of the hydrophobic 18-MEA layer. Practical data from 30 salons support these findings, showing increased client satisfaction and reduced hair breakage.