Herbal Nanoemulgel-: A Comprehensive Review On Formulation, Mechanism, Characterization And Method Of Preparation

Herbal nanoemulgel technology has emerged as an advanced topical delivery system that combines the advantages of nano emulsions and hydrogels to enhance the effectiveness of herbal hair dyes. This review highlights the formulation, mechanism of action, characterization, therapeutic potential, and applications of herbal nanoemulgel-based hair dye systems. The incorporation of herbal ingredients such as Lawsonia inermis (henna), Indigofera tinctoria (indigo), Phyllanthus emblica (amla), Eclipta prostrata (Bhringraj), Juglans regia (walnut), Coffea arabica (coffee), Tagetes erecta (marigold), Aloe barbadensis (aloe vera), and Hibiscus rosa-sinensis provides natural pigmentation along with antioxidant, conditioning, and scalp-protective properties. The nanoemulgel system enhances dye penetration into the hair shaft through nanosized droplets, improves colour retention, offers controlled release of bioactive compounds, and minimizes dripping and scalp irritation compared with conventional hair dyes. This review also discusses formulation components, preparation methods, characterization parameters, advantages, limitations, and various types of Nanoemulgel, while comparing herbal nanoemulgel formulations with conventional and synthetic hair dyes. Overall, herbal nanoemulgel-based hair dyes represent a safe, eco-friendly, and biocompatible alternative for effective hair coloring with additional hair and scalp health benefits. However, further optimization, standardization, and clinical studies are required to establish their long-term safety, efficacy, and commercial applicability.