Within the types taxonomy, beta‑glucan is classified primarily by source, each imparting distinct molecular weight and solubility profiles that influence end‑use performance. Cereal‑derived beta‑glucan, sourced from oats and barley, exhibits a high degree of β‑(1→3),(1→4) linkages, making it especially effective for soluble fiber claims in food applications. Mushroom‑derived variants (e.g., from shiitake or maitake) contain β‑(1→3),(1→6) structures, conferring stronger immunomodulatory activity and thus attracting pharmaceutical and nutraceutical developers. Yeast‑derived beta‑glucan, typically extracted from Saccharomyces cerevisiae, offers a highly branched architecture that enhances macrophage activation, positioning it for high‑value dietary supplement formulations. Algal sources, though emerging, provide unique sulfated beta‑glucans with potential antiviral properties, opening niche opportunities in functional foods and specialty pharmaceuticals. The relative market share of each type aligns with its application fit, reinforcing the importance of precise source identification in the overall market taxonomy.