May 2023 in “Health science reports” Coloring shampoos for gray hair may cause gene mutation, reproductive issues, and skin damage, needing stricter regulation and expert consultation.
June 2025 in “International Journal of Environmental Sciences” The herbal shampoo with Sapindus emarginatus and Curcuma longa was most liked and effective against bacteria.
October 2023 in “Biomimetics” The new hair-dyeing shampoo is safe, colors hair evenly, and strengthens it.
August 2024 in “Cosmetics” K18® and Olaplex® both effectively repair bleached hair, improving its strength, smoothness, and overall health.
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June 2004 in “Alternative and Complementary Therapies” The document concludes that hair loss is influenced by genetics and other factors, and while treatments like finasteride can help, they have limitations and side effects.