 
    Hyaluronic acid in shampoo penetrated hair well, reduced frizz, and improved hair strength and moisture.  
      25 citations
,
  May 2019   in “Heliyon”
           25 citations
,
  May 2019   in “Heliyon”    Hair treatments cause significant structural changes, especially with excessive heat, regardless of ethnicity.  
      6 citations
,
  May 2020   in “Molecules/Molecules online/Molecules annual”
           6 citations
,
  May 2020   in “Molecules/Molecules online/Molecules annual”    Yak belly hair has higher porosity and is less stiff than human hair, making it absorb dye better but less suitable as a direct substitute for hair dyeing.  
      October 2025   in “Clinical Cosmetic and Investigational Dermatology”
           October 2025   in “Clinical Cosmetic and Investigational Dermatology”    SP treatment improves hair health and moisture retention better than water treatment.  
      August 2024   in “Cosmetics”
           August 2024   in “Cosmetics”    K18® and Olaplex® both effectively repair bleached hair, improving its strength, smoothness, and overall health.