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Lambda carrageenan is a widely used food additive. It has been shown that its oral intake induces suppression of T cell proliferation and antibody-mediated and cell-mediated immune response in experimental animals. In this study, we estimated the effect of oral ingestion of 0.001% λ-carrageenan on trinitrochlorobenzen-induced atopic dermatitis model mouse. Oral carrageenan ingestion alleviated ear swelling of hapten challenged mice and significantly suppressed mast cell hyperplasia in the topical skin. Serological analysis revealed that t