Igxolo lomuthi we-oak eligayiwe (Quercus spp.): isisetshenziswa esiyinhloko esimlando sokulungisa isikhumba eYurophu. Licebile nge-ellagitannin, ehlanganisa izinhlamvu ze-collagen futhi ikhiqiza isikhumba esilungiswe ngezimila esihlala isikhathi eside nesimelana namanzi. Lisetshenziswa futhi njengomthombo wombala onsundu nanjengekhambi.