Impact of Hair Damage on the Penetration Profile of Coconut, Avocado, and Argan Oils into Caucasian Hair Fibers

April 2024 in “ Cosmetics ”

Carolina Botelho Lourenço, Rebeca Mantuan Gasparin, Fernanda Malanconi Thomaz, Gustavo Carlos da Silva, Aírton Abrahão Martin, Ana Cláudia Paiva‐Santos, Priscila Gava Mazzola

argan oil avocado oil coconut oil hair fibers virgin hair bleached hair mechanical parameters fatigue test fracture resistance premature rupture penetration profiles triglyceride composition hair cortex

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cosmetic product that temporarily makes hair appear thicker

Studysummary Different oils affect hair flexibility and strength, with their impact varying on whether hair is virgin or bleached. Our plain-language summary of this paper — not a Tressless recommendation.

The study evaluated the penetration of argan, avocado, and coconut oil into hair fibers and their impact on hair structure. In virgin hair, argan oil increased flexibility, while avocado and coconut oil reduced it. In bleached hair, all oils reduced mechanical parameters, with argan oil having the most significant impact. The fatigue test showed that in bleached hair, avocado and coconut oil treatments increased resistance to fracture, while argan oil treatment reduced it. In virgin hair, all tested oils increased the premature rupture of fibers. The oils' penetration profiles were analyzed at different depths of the hair fiber, with coconut oil identified at a higher intensity in depths beyond 30 µm in both hair conditions. The oils' triglyceride composition influences their affinity with hair, which varies depending on the hair's damage condition. The study concluded that all three oils can penetrate and interact with the hair cortex, but their effects vary depending on the hair's condition.

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