Olive Leaf Extract: How It Works, Evidence & Safety
Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team
Olive leaf extract is a polyphenol-rich botanical (notably oleuropein) studied for antioxidant and circulatory support. It appears in cognitive and heart-health formulas.
What is Olive Leaf Extract?
Olive leaf extract comes from the leaves of the olive tree and is standardised for polyphenols such as oleuropein.
How Olive Leaf Extract works
Its polyphenols act as antioxidants and are studied for supporting healthy blood pressure and circulation, which underlies its use in brain- and heart-support products.
What the evidence says
- Studies have examined olive leaf polyphenols for blood pressure and antioxidant effects. (PubMed research)
How much do studies use?
Standardised extracts have been studied around 500-1000 mg per day. This is research information, not a recommendation.
Safety and side effects
Generally well tolerated; mild stomach upset is occasionally reported.
Who should avoid Olive Leaf Extract?
Because it may lower blood pressure, people on blood-pressure medication should check with a doctor first.
Frequently asked questions
What is olive leaf extract used for?
It is used for antioxidant and circulatory support. It is nutritional support, not a treatment for any condition.
Can it lower blood pressure?
Some research suggests a mild effect, so people on blood-pressure medicines should consult a doctor before using it.