30 citations
,
  September 2018   in “International Journal of Cosmetic Science”    Bleaching hair causes severe structural and chemical damage, including protein loss and oxidation.  
               38 citations
,
  May 2000   in “Livestock production science”    Giving high-quality protein or methionine supplements helps improve hair growth in Angora goats and, to a lesser extent, in Cashmere goats.  
      7 citations
,
  January 1982   in “Acta agriculturae Scandinavica”
           7 citations
,
  January 1982   in “Acta agriculturae Scandinavica”    Mink use L-methionine and L-cystine slightly better than natural amino acids for hair growth, but D-methionine is not effective.  
      1 citations
,
  March 2014   in “Senses and Sciences”
           1 citations
,
  March 2014   in “Senses and Sciences”    A supplement with Serenoa repens improved hair loss in a patient.  
      14 citations
,
  April 2000   in “Animal Science/Animal science”
           14 citations
,
  April 2000   in “Animal Science/Animal science”    Nutrients like vitamins, copper, zinc, and amino acids are crucial for healthy hair and wool growth.