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Protein Treatments for Reduced Hair Breakage

TRI would like to announce the publication of a second paper on the topic of defying the damage of textured hair.

Continuing on the topic of defying the damage of textured hair (“Defying damage: Understanding breakage in Afro-textured hair”, we would like to announce the publication of our second paper in this area: “Penetration of different molecular weight hydrolysed keratins into hair fibres and their effects on the physical properties of textured hair” by E. Malinauskyte, R. Shrestha, P. Cornwell, S. Gourion-Arsiquaud and M. Hindley ( ).

This paper was funded jointly with Croda. The data from this paper were introduced during the DWI conference in 2019 for the first time, and subsequently at the TRI seminar of the same year. The data and the research area itself peaked interest of many scientists who were asking to share this publication. There were so many requests that we decided to make it open access so everyone could satisfy their curiosity.

In summary, our study compared the effect of low‐, mid‐ and high‐MW peptides on relaxed hair using the same test conditions. The high‐MW keratin peptides only penetrated the surface layers of relaxed textured hair, whereas the mid‐range keratin peptides were able to penetrate deeper into the cortex. However, both the mid‐range and high‐MW keratin peptides were able to improve breakage parameters: increasing break stress and reducing the number of premature fractures. The fiber dimension measurements suggested significant penetration of the low‐MW keratin peptides and leucine which increased cross‐sectional area of the hair, but unfortunately did not have any protein stabilizing effect. Enjoy!

For background information about protein effects on hair try watching our TRI Talk from 2020; “Bringing sand to the beach: The effects of proteins on hair” (

For information about our research and testing capabilities please visit

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