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Ulvans are cell wall polysaccharide derived from the genus Ulva (Ulvaarmoricana, Ulvalactuca, Ulvarotundata, and Ulvarigida) of green macroalgae belonging to the Chlorophyta group. Ulvan roughly contributes from 9 to 36% dry weight of the biomass of Ulva and primarily consist of sulfated rhamnose, uronic acids (glucuronic acid and iduronic acid), and xylose units [88, 104, 105]. The ulvans are widely known for the antioxidative, chelating, gelling, moisturizing, and protective properties. The antioxidant capacity of ulvan is modulated by ROS scavenging and inhibition of lipid peroxidation. Besides, ulvans are also known to suppress antiaging by enhancing the endogenous enzymatic antioxidant systems such as superoxide dismutase, catalase, and glutathione peroxidase activities owing to the abundant sulfated polysaccharides [88, 90, 104]. Moreover, the gelling property of ulvan is not significantly affected in the presence of various cations (Ca²⁺, Cu²⁺, and Zn²⁺), in the pH range of 7.5–8.0 and temperature up to 180 °C makes it a rheological suitable in cosmetic formulations [88, 91].