February 2026 in “Journal of the Korean Society of Cosmetology” This study found that the viscosity of silicone oil in hair treatments significantly affects wave curling performance and hair damage, with untreated and chemically treated hair showing different optimal viscosities.
This study found that adding Rosehip extract to permanent waving products with cysteine improved waving efficiency and reduced hair damage compared to thioglycolate-based products.
August 2026 in “Journal of the Korean Society of Cosmetology” In this study, researchers observed that Sedum takesimense extract improved the surface properties, moisture retention, tensile strength, and wave formation of damaged hair compared to a water control, even after additional chemical and UV damage, suggesting its potential as a protective hair treatment.
March 2016 in “The Korean Society of Beauty and Art” This study found that using a hair-hardener improved hair thickness, amino acid content, surface condition, tensile strength, and wave efficiency without causing any allergic reactions in participants.
August 2021 in “Han'gug miyong haghoeji/Journal of the Korean society of cosmetology” This study found that using natural polyphenol cross-linkers like tannic acid and green tea extract during perm treatments improved perming efficiency, wave maintenance, and hair protection compared to a control group.
