Abstract: A new use or method of use of a thylakoid extract, for oral route of administration, and a composition comprising the thylakoid extract in adjunction with an acceptable carrier for oral administration. Also described is a method for treating or preventing a disease or disorder involving the formation of reactive oxygen species inflammation in an individual, which comprises the step of orally administering an effective dose of a thylakoid extract. Also described is an oral composition comprising purified thylakoids and a carrier for oral ingestion or oral administration, with the proviso that the carrier does not essentially consist of water, physiological saline or propylene glycol. The thylakoid extract or composition is also provided as a food or a food supplement, or as a pellet, or encapsulated granules or powder.