Other plant compounds
Olives are rich in many plant compounds, particularly antioxidants, including:

Oleuropein. This is the most abundant antioxidant in fresh, unripe olives. It is linked to many health benefits.

Hydroxytyrosol. During olive ripening, oleuropein is broken down into hydroxytyrosol. It is also a powerful antioxidant.

Olives are a good source of vitamin E, iron, copper, and calcium. They may also contain high amounts of sodium if packaged in saltwater.