A composition comprised of a plurality of levan oligomers, wherein at least 70% (w/w) of said plurality of levan oligomers are characterized by: (i) weight average molecular weights (MW) of 540 to 1000 g/mole, and (ii) a dispersity index (Ð) of less than 2 is disclosed herein. Uses of the levan composition, such as, as a feed additive, growth promoter and for improving the rejuvenation and healing of a human skin, are also disclosed.