Is Hydroxytyrosol present in all types of olive oil?

No. Hydroxytyrosol is mainly present in extra virgin olive oil (EVOO: 125-150 mg HT/Kg) and in a smaller amount in virgin olive oil (VOO: 75-100 mg HT/Kg), with very little amount present in refined olive oil (ROO: 50 mgHT/Kg).

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