The marine environment is considered as a precious source of novel marinederived
natural products which offer valuable, safer and affordable promising compounds.
Various universities and pharmaceutical industries are more and more interested in these
novel compounds due to their exceptional health benefits. Unique ingredients found in the
marine biosphere are polysaccharides, polyphenols, polyunsaturated fatty acids (PUFA), enzymes
and bioactive peptides, minerals and vitamins to name a few. In order, to exploit sustainably
the treasures of the ocean, in depth understanding and research are a must to pave
the way for a better future. This review focuses mainly on the structure, biological properties
and applications of some polysaccharides derived from marine macroalgae, marine fauna as
well as exopolysaccharides (EPS) from marine microorganisms.