March 2023 in “Asian journal of beauty & cosmetology” Keratin pretreatment improves the quality of damaged hair during perming.
5 citations
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May 2021 in “International Journal of Cosmetic Science” Healthy scalp leads to better hair quality and less damage.
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.
Justicia procumbens extract may help prevent hair loss and improve hair thickness and shine in a type of hair loss condition.
September 2025 in “Cosmetics” NMN supplements may improve hair quality and appearance in middle-aged women.