Lactose ndi disaccharide yomwe imapezeka mu mkaka wa mammalian, wopangidwa ndi molekyu imodzi ya shuga ndi molekyulu imodzi ya galactose. Ndilo gawo lalikulu la lactose, gwero lalikulu la chakudya cha anthu ndi nyama zina zoyamwitsa paubwana. Lactose imagwira ntchito zofunika m'thupi la munthu. Ndi gwero la mphamvu.