A composition includes a Euglena whole cell biomass and cellular components, including beta-1,3-glucan as at least about 90 percent linear, unbranched beta-1,3-glucan polysaccharide polymers having an average molecular weight of 1.2 to 580 kilodaltons (kDa) and beta-glucan polymer chains having a polymer length of about 7.0 to 3,400 glucose monomers. Residual media remains from a heterotrophic fermentation process that produced the Euglena biomass. The composition may be in different delivery forms and include added immune response inducing components.
