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December 2021 in “Annals of phytomedicine” The herbal hair dye with a 1:2 henna to indigo ratio works well, is safe, and eco-friendly.
January 2020 in “Journal of Pharmacognosy and Phytochemistry” The VCO-based herbal hair tonic is effective, safe for hair loss treatment, and can be mass-produced.
January 2025 in “International Journal of Advanced Research in Science Communication and Technology” Polyherbal hair dyes are safer and more eco-friendly than chemical dyes.
November 2025 in “Zenodo (CERN European Organization for Nuclear Research)” The review discusses the benefits of polyherbal hair dye creams as a safer alternative to synthetic dyes, which often contain harsh chemicals that can cause irritation, hair breakage, and skin discoloration. The study focuses on formulating a herbal hair dye using natural ingredients like Indigo, Henna, Hibiscus rosa, amla, blueberry, and beheda. These herbal dyes are found to be effective colorants that mimic natural hair color, offer better dyeing effects, and have greater retention capacity without side effects. Additionally, they are more economical and eco-friendly compared to conventional chemical-based hair dyes.
April 2024 in “Pharmacognosy research” The herbal hair dye with natural ingredients like henna was successfully made and tested, but more research is needed on its effectiveness on different hair colors and benefits.