May 2009 in “International Journal of Cosmetic Science” Permanent waving damages hair protein and weakens hair, especially with repeated treatments using sodium thioglycolate.
3 citations
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August 2008 in “PubMed” Repeated digital perming with sodium thioglycolate lotion significantly damages hair protein and structure.
2 citations
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July 2013 in “Fashion business” Keratin essence protects and improves damaged hair.
1 citations
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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.
May 2024 in “Journal of Cosmetic and Laser Therapy” Injectable platelet-rich fibrin improves hair growth and reduces hair loss in women.