Olive leaf extract comes from the leaves of the olive tree (Olea europaea) and contains polyphenols like oleuropein. People take it to help maintain cardiovascular health and blood pressure already in the normal range. Others use it for immune support. It comes in capsules, liquid tinctures, or tea. The right dose depends on the product's form and concentration.
This extract can interact with blood pressure medications and may amplify the effects of blood thinners, raising the risk of bleeding. It might also lower blood sugar; people on diabetes medication should check their levels closely. Stop taking it before surgery, as it can affect blood pressure and bleeding. Pregnant or breastfeeding individuals should consult a healthcare provider before use.