Polygonum multiflorum (Fo-Ti) Oil is a lipophilic botanical extract derived from Polygonum multiflorum (syn. Fallopia multiflora), a plant widely documented in traditional East Asian pharmacopeias. When prepared as an oil extract for cosmetic use, Fo-Ti oil contains a complex mixture of lipophilic stilbenes, anthraquinone derivatives, phenolic compounds, and fatty constituents. In skincare formulations, this ingredient is primarily valued for its antioxidant and emollient behavior, helping mitigate oxidative stress at the skin surface while improving softness, glide, and overall sensory quality. The oil matrix promotes adherence to the stratum corneum, supporting surface lipid replenishment and contributing to improved barrier comfort in oil-rich or emulsion-based systems.

In haircare applications, Polygonum multiflorum oil is commonly incorporated as a conditioning and protective botanical oil. Its lipid profile improves cuticle lubrication, reduces inter-fiber friction, and enhances surface smoothness and shine. Antioxidant components may help protect scalp and hair surface lipids from oxidative degradation caused by UV exposure and environmental pollutants. While Fo-Ti is traditionally associated with hair vitality, cosmetic formulations rely on surface-level conditioning and protective effects rather than biological hair growth stimulation. As such, its value lies in sensory enhancement and botanical positioning rather than pharmacological activity.