Polyherbal hair oils represent one of the most widely used categories in herbal cosmetic science, combining multiple medicinal plant extracts to achieve synergistic therapeutic effects for hair growth promotion and scalp health improvement. This review comprehensively examines the botanical constituents, phytochemical profiles, mechanisms of action, formulation methods, and evaluation parameters relevant to polyherbal hair oil preparations. Key medicinal plants—Amla (Emblica officinalis), Bhringraj (Eclipta alba), Neem (Azadirachta indica), Hibiscus (Hibiscus rosa-sinensis), and Fenugreek (Trigonella foenum-graecum)—are discussed in detail with respect to their documented pharmacological activities including antioxidant, antimicrobial, anti-inflammatory, and hair growth–stimulating properties. The review further addresses common hair disorders such as alopecia, dandruff, premature greying, and hair thinning, and discusses how polyherbal formulations target these conditions through multi-modal biological pathways. Formulation methodology, standardized quality evaluation parameters, stability testing, and recent advances in nano-herbal delivery systems are systematically reviewed. The study concludes that polyherbal hair oils offer a scientifically validated, economically accessible, and environmentally sustainable alternative to synthetic cosmetic products, with significant potential for industrial-scale standardization and clinical application.
Sanjay et al. (Tue,) studied this question.