January 2001 in “China Surfactant Detergent & Cosmetics” This study compared the protective effects of two conditioners, Protective factor C and Keratin, on hair damaged by perm treatment using a model of damaged hair.
March 2023 in “Asian journal of beauty & cosmetology” This study found that applying a keratin solution improved tensile strength, reduced absorbance, and increased gloss in damaged hair compared to untreated hair.
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January 2007 in “Sen'i Gakkaishi” This study found that permanent wave treatment accelerates hair degradation after protease exposure, showing significant morphological differences compared to untreated hair and linked to damage from Alpha-helical region denaturation.
January 2002 in “China Surfactant Detergent & Cosmetics” This study compared shampoos and found that shampoo D, containing polyquaternium-10, guar gum, and dimethicone, was most effective in restoring chemically permed hair.
April 2023 in “Han'gug miyong haghoeji/Journal of the Korean society of cosmetology” This study compared the effects of direct heat perms and softening heat perms on hair, analyzing damage and morphological changes to understand their impact on hair fibers and provide foundational data for future research.