16 citations
,
  August 2000   in “Il Farmaco”    Men have more tryptophan in their hair than women, and it increases with age and is higher in darker and grey or white hair.  
               15 citations
,
  June 2019   in “JEADV. Journal of the European Academy of Dermatology and Venereology/Journal of the European Academy of Dermatology and Venereology”    Chemical and physical treatments like bleaching, dyeing, and UV radiation damage both Caucasian and Afro-ethnic hair.  
      3 citations
,
  June 2019   in “Journal of cosmetic dermatology”
           3 citations
,
  June 2019   in “Journal of cosmetic dermatology”    Lower pH straighteners change hair more but weaken it.  
      June 2024   in “Molecules/Molecules online/Molecules annual”
           June 2024   in “Molecules/Molecules online/Molecules annual”    Platycladus orientalis flavonoids protect balding hair from UV damage and slow hair color change.  
      July 2025   in “Journal of Cosmetic Dermatology”
           July 2025   in “Journal of Cosmetic Dermatology”    The model shows how heat damages hair, helping test hair care products.