Low molecular weight modified pectin, particularly modified citrus pectin (MCP), and/or low molecular weight modified alginate is useful in a composition for stimulating the immune response of a mammal, particularly a human. Modified pectin and/or modified alginate is administered in a composition in an amount sufficient to modulate, support, enhance or extend an immune response, particularly to an individual having an inadequate or reduced immune function. Stimulation of an immune response is evidenced by stimulation of cell-mediated immune function, humoral immune function, phagocytic function of mononuclear macrophages, and NK cell activity. The composition also may comprise well known pharmacologically acceptable agents, such as sulfured amino acids, cilantro, garlic, minerals, and herbs.
