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Over the years, bioactive and biocompatible natural products have received increased attention as ingredients of cosmeceutical formulations owing to their robust properties compared to many of the synthetic chemicals in use. Many natural products derived from algae have shown promising cosmetizing properties. Seaweed polysaccharides, in particular, have received increased attention for their biofunctional and physicochemical characteristics. This study aimed to design a cost-effective strategy to purify fucoidans from the untapped brown algae Chnoospora minima (CMF) and Sargassum polycystum (SPF) harvested in Sri Lanka and to evaluate their cosmetizing properties. Based on Fourier transform infrared (FTIR) spectroscopy and monosaccharide composition analysis, the purified polysaccharides were rich in fucoidan. Relatively high sulfate content was detected in both fucoidans. Experiments …