45 citations
,
December 2006 in “Biopolymers” Permanent waving weakens hair by altering its protein structure.
5 citations
,
June 2013 in “Fashion business” Rosehip extract improves hair wave, thickness, and color vibrancy.
5 citations
,
January 1990 in “Journal of Society of Cosmetic Chemists of Japan” Permanent wave lotion can extract proteins from hair, especially when pH is higher, and repeated treatments or bleaching can damage hair.
2 citations
,
September 2010 in “Journal of the Korea Academia-Industrial cooperation Society” Using 2% collagen in perms reduces hair damage while keeping curls.
1 citations
,
April 2021 in “Han'gug miyong haghoeji/Journal of the Korean society of cosmetology” Aspartic acid at 0.75% makes perms more effective and less damaging to hair.