8 citations
,
February 2020 in “International Journal of Morphology” Henna dye improves hair cuticle and thickness but effects vary by hair type and health.
1 citations
,
December 2022 in “Journal of applied biological chemistry” TRP-hair essence protects hair from heat damage, maintains color, and strengthens hair.
18 citations
,
July 2015 in “Journal of cosmetic dermatology” Straightening and coloring hair, especially with sodium hydroxide, greatly increases protein loss.
5 citations
,
August 2007 in “PubMed” Amino acids in conditioners improve hair strength, hydration, and color retention.
3 citations
,
February 2023 in “ACS omega” Grape seed oil improved hair quality the most, followed by rosehip and safflower seed oils, and reduced damage from shampoo.