Arabinoxylan is a non-starch polysaccharide primarily derived from cereal grains, acting as a dietary fiber with immunomodulatory properties. It exerts its effects by stimulating innate and adaptive immune responses, enhancing macrophage and natural killer (NK) cell activity, and modulating cytokine production (e.g., increasing interleukin-2 and interferon-gamma). Additionally, it acts as a prebiotic, promoting the growth of beneficial gut microbiota which further supports systemic immune function and gut barrier integrity. Its antioxidant properties help reduce oxidative stress, contributing to cellular protection and anti-inflammatory effects.