Olive Leaf Extract
Olive Leaf Extract (Oleuropein)
Mediterranean herb with antimicrobial, immune-supporting, and cardiovascular benefits.
Olive Leaf Extract contains oleuropein and other polyphenols that provide antimicrobial, antioxidant, and cardiovascular benefits. Used traditionally for infections and immune support, modern research confirms antiviral, antibacterial, and blood pressure benefits. Part of the Mediterranean diet's protective effects.
Mechanisms of Action
Antimicrobial Activity
Direct action against bacteria, viruses, and fungi
ACE Inhibition
Helps relax blood vessels
Recommended Dose
500-1000mg (standardized to 15-20% oleuropein)
Optimal Timing
- With meals
Take with food
Best Form
Standardized extract (15-20% oleuropein)
Alternatives: Dried leaf, Tincture
Standardized extracts are more consistent. Higher oleuropein content means higher potency.
Duration
Minimum: 4 weeks
Optimal: 8 weeks
Cycling: Not required
Note: Can be taken any time. Split dosing (2-3 times daily) may be beneficial.
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Immune Support
Enhanced resistance to infections
Blood Pressure Support
Modest BP reduction
Insufficient data; consult doctor
Who Should NOT Take This
- Known allergy or hypersensitivity to Olive Leaf Extract or related compounds
- Pregnancy and breastfeeding
- Low blood pressure (may lower BP further)
Drug Interactions
May have additive effects
May affect blood sugar
Possible Side Effects
Tip: Take with food
Tip: Start with lower dose
Warnings
- May cause die-off symptoms initially if addressing infections
- Start low and increase gradually
Top studies from 40+ peer-reviewed papers
Frumuzachi O et al. β’ Critical reviews in food science and nutrition (2025)
βOverall, the meta-analysis suggests that supplementation with OLE, HT, and TYR may beneficially impact some cardiometabolic parameters, though further studies are needed to confirm these findings.β
Key Findings:
- Fourteen human intervention studies with 594 participants were included.
- Subgroup analysis showed that, in certain contexts, interventions may be more beneficial for BMI <30, non-Mediterranean, and cardiometabolic disease individuals, while intervention compound, type of intervention, and duration might have differential effects regarding considered outcomes.
- Overall, the meta-analysis suggests that supplementation with OLE, HT, and TYR may beneficially impact some cardiometabolic parameters, though further studies are needed to confirm these findings.
Ussia S et al. β’ Nutrients (2025)
βDespite these results, further multicenter clinical studies with a wider range of patients are required to confirm and better understand EVOO's effects on the prevention of cardiovascular risk.β
Key Findings:
- The beneficial effect was attributed to the polyphenols contained in EVOO.
- Indeed, EVOO supplementation as part of the Mediterranean diet could improve patients' quality of life in secondary prevention by demonstrating a positive correlation with the cardioprotective role of polyphenols.
- Discussion: A balanced diet with VOO represents a simple yet potent method to counteract metabolic dysfunctions associated with CVD.
- Despite these results, further multicenter clinical studies with a wider range of patients are required to confirm and better understand EVOO's effects on the prevention of cardiovascular risk.
Γlvares AA et al. β’ Nutrition reviews (2024)
βIn the meta-analysis, fasting glycemia, as evaluated in studies using a low dose of OLE, showed a significant result favoring the control group.β
Key Findings:
- In the meta-analysis, fasting glycemia, as evaluated in studies using a low dose of OLE, showed a significant result favoring the control group.
- To obtain more consistent results, further clinical studies in humans, using similar methodologies, are required.
- Further research warranted to confirm findings
Angelopoulos N et al. β’ Nutrients (2023)
βOur results confirm the LDL-C-lowering properties of monacolin are clinically meaningful even in lower doses of 3 mg/day.β
Key Findings:
- LDL-C decreased by 26.46% on average (p < 0.001) during treatment with 10 mg of monacolin and by 16.77% on average during treatment with 3 mg of monacolin (p < 0.001).
- We observed a slight but significant reduction of the triglyceride levels only in the high-dose-treated group (mean -4.25%; 95% CI of mean -11.11 to 2.61).
- No severe adverse events occurred during the study.
- Our results confirm the LDL-C-lowering properties of monacolin are clinically meaningful even in lower doses of 3 mg/day.
Wong RH et al. β’ Nutrients (2014)
βFurther dose-response evaluation of olive leaf, green coffee bean or beetroot extracts is required to confirm or refute the purported benefits.β
Key Findings:
- Baseline clinic BP in 37 overweight middle-aged men and women who completed the trial averaged 145/84 mmHg.
- There was no significant effect of treatment on ABP or any other outcome measure.
- The failure to confirm prior evidence of the antihypertensive benefits of these extracts emphasises the importance of placebo control and the value of ABP monitoring.
- Further dose-response evaluation of olive leaf, green coffee bean or beetroot extracts is required to confirm or refute the purported benefits.
Study Type Distribution
Goals This Supplement Supports
Related Goals
This information is for educational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider before starting any supplement.