January 2023 in “Fashion and textiles” This study found that hair dyed with anionic basic hair dye lost more color after shampooing compared to cationic and nonionic dyes, with alkaline shampoo increasing this effect.
June 2022 in “International Journal for Research in Applied Science and Engineering Technology” The research developed a herbal shampoo using extracts from Piper Betel and Psidium Guajava leaves, which showed potential in promoting hair growth and managing hair diseases, while replacing synthetic ingredients with safe natural alternatives.
September 2011 in “Daehan miyong hakoeji” Henna orange powder, especially with alkali, protects and colors hair better than oxidizing colorants.
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April 2007 in “Journal der Deutschen Dermatologischen Gesellschaft” This article reviews the development and formulation of shampoos, emphasizing their dual role as cosmetic and medicinal products, but presents no new experimental findings.
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April 2025 in “International Journal of Pharmaceutical Research and Applications” This study formulated and evaluated a herbal shampoo with natural ingredients, finding it to be a viable alternative for hair cleansing and maintenance without adverse effects, suggesting it could reduce reliance on shampoos with synthetic chemicals.