Thorne Olive Leaf Extract Review
Thorne Research Olive Leaf Extract (Immunity), sold as 60 vegetarian capsules, is presented on this Mass-Zone page as an antioxidant that supports healthy immune function and optimal cytokine levels. The page explains that olive leaf extract is derived from the leaves of the olive tree (Olea europaea) and contains compounds, specifically oleuropein, that have demonstrated antioxidant and immune-enhancing properties. The page states that Thorne's Olive Leaf Extract contains 18 percent oleuropeins, and that extracts from olive leaf can help maintain a healthy balance of cytokines in the body. Cytokines are described as proteins secreted by cells of the immune system that act as chemical messengers, helping to regulate the body's immune response and inflammatory response. The page further states that evidence suggests olive leaf extract is beneficial for dilating coronary blood vessels, supporting blood flow to the heart and helping to maintain already normal blood pressure and cardiac rhythm. The EAN printed on the page is 693749763031. The dosage section recommends taking 1 capsule two to three times daily or as recommended by a health professional, with a serving size of 1 capsule. The ingredients table lists a container of 60 vegetarian capsules with 60 servings per container and a form of capsule. Each capsule contains Olive Leaf Extract at 500mg. The other ingredients are listed as Olive Leaf Extract; Hypromellose Capsule, Leucine, Silicon Dioxide. The nutritional information section states that the product is a dietary supplement used for weight control as a substitute for everyday diet, and that it cannot replace a healthy and balanced diet. Consumers are advised to consult a healthcare practitioner before use, especially if pregnant or nursing, and not to exceed the recommended daily dosage. The page notes the product should be kept out of reach of children and lists the best before date as shown on the package. The manufacturer is listed as Thorne Research, Inc., P.O. Box 25, Dover, Idaho 83825 USA. The product is currently shown as unavailable with 0 pieces available, and the page notes no price change for the last 30 days. The listed price per portion is 0,49 euro. The page also offers loyalty points and a notification option for when the item is back in stock.
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Study, Trial or Testing Result Summary
Members Only21 human studies · 12 improved
1 of these 21 human studies gave olive leaf by drip, not by mouth.
This product gives 1500 milligrams of olive leaf extract a day, a full dose compared with the amounts that worked in studies. A 2026 review of 30 randomized trials with 1,726 people found olive leaf supplements lowered both the upper and lower blood pressure numbers [1]. In a large 2025 trial of 621 people treated for high blood pressure, 12 weeks of olive leaf extract lowered 24-hour upper blood pressure by 6.4 points from the start, compared with 1.5 points on placebo [2]. A 2021 review of 5 trials with 325 adults found 500 milligrams a day lowered upper blood pressure by about 5.8 points, though the 1,000 milligram comparisons did not show a clear change [3]. A 2017 trial in 60 men with slightly high blood pressure found 6 weeks of extract lowered daytime and 24-hour blood pressure [4]. A 2026 trial in 70 adults found olive leaf extract plus potassium lowered home morning upper blood pressure by 5.4 points more than placebo [5]. A 2024 review of 12 trials found better blood pressure in only 2 of them [6]. Smaller placebo trials of 46, 56 and 77 people found no blood pressure benefit. Overall, the newest and largest studies favor a modest drop in blood pressure. Animal and cell studies are never counted.
See all 21 studies →Hide the studies
- Across 30 randomized trials with 1,726 people, olive leaf supplements lowered systolic and diastolic blood pressure, along with cholesterol, body weight and one inflammation marker, while olive pomace showed no consistent benefit.A GRADE-assessed systematic review and meta-analysis of randomized controlled trials evaluating the effects of olive lea…
- In 12 randomized trials with 703 adults lasting up to 12 weeks, olive leaf extract was linked to better blood pressure in 2 trials, plus better lipids, inflammation markers and glucose handling, but low-dose extract favored the control group for fasting glucose.Olive leaf extract effect on cardiometabolic risk factors: a systematic review and meta-analysis of randomized clinical …
- In 5 trials with 325 adults with prehypertension or hypertension, 500 mg a day lowered systolic blood pressure by about 5.8 mmHg over at least 8 weeks, but the 1,000 mg comparisons showed no significant blood pressure change versus placebo.Olive leaf extract effect on cardiometabolic profile among adults with prehypertension and hypertension: a systematic re…
- In 621 people treated for hypertension, 12 weeks of olive leaf extract lowered 24-hour systolic blood pressure by 6.4 mmHg from baseline versus 1.5 mmHg with placebo, and also improved lipids, inflammation and body weight.Efficacy of olive leaf extracts in controlling blood pressure in hypertensive patients: a double-blind randomized clinic…
- In 134 people with grade 1 high blood pressure, 8 weeks of a hibiscus and olive leaf product lowered blood pressure by about 15/9.5 mmHg, similar to the drug captopril, with no placebo group.Antihypertensive efficacy and safety of a standardized herbal medicinal product of Hibiscus sabdariffa and Olea europaea…
- In 96 healthy adults, 8 weeks of a grapefruit, bitter orange and olive leaf extract combination lowered systolic and diastolic blood pressure versus placebo and improved cholesterol, oxidative stress and inflammation markers.Effect of a Combination of Citrus Flavones and Flavanones and Olive Polyphenols for the Reduction of Cardiovascular Dise…
- In 77 overweight or obese adults with mildly high cholesterol, 500 mg a day of olive leaf extract for 8 weeks did not change blood pressure or blood lipids compared with placebo.The effect of olive leaf extract on cardiovascular health markers: a randomized placebo-controlled clinical trial.
- In 70 adults with mildly to moderately high blood pressure, 12 weeks of olive leaf extract plus potassium lowered home morning systolic blood pressure by 5.4 mmHg more than placebo and improved cholesterol and insulin sensitivity.Effects of a combination of olive leaf extract and potassium on blood pressure in participants with mild to moderate hyp…
- In 60 men with slightly high blood pressure, 6 weeks of olive leaf extract (136 mg oleuropein daily) lowered daytime and 24-hour blood pressure and also lowered cholesterol, triglycerides and one inflammation marker compared with a control.Impact of phenolic-rich olive leaf extract on blood pressure, plasma lipids and inflammatory markers: a randomised contr…
- In 60 adults with high blood pressure, 12 weeks of olive leaf extract tablets lowered inflammation markers compared with placebo but did not change blood sugar, liver or kidney measures; blood pressure results were not reported in the abstract.Effects of Olive Leaf Extract on Metabolic Response, Liver and Kidney Functions and Inflammatory Biomarkers in Hypertens…
- In 56 adults with systolic blood pressure of 130 or higher, 8 weeks of 440 mg olive extract daily lowered blood pressure no more than placebo did.Evaluation of the effect of olive extracts on blood pressure and cardiovascular health markers in adults: Findings from …
- In 46 overweight middle-aged men, 12 weeks of olive leaf extract improved insulin sensitivity but had no effect on 24-hour blood pressure compared with placebo.Olive (Olea europaea L.) leaf polyphenols improve insulin sensitivity in middle-aged overweight men: a randomized, place…
- In adults with stage 1 hypertension, 500 mg of olive leaf extract twice daily for 8 weeks lowered systolic pressure by about 11.5 mmHg, a drop not significantly different from the 13.7 mmHg drop with captopril.Olive (Olea europaea) leaf extract effective in patients with stage-1 hypertension: comparison with Captopril.
- In 40 borderline hypertensive monozygotic twins, 1000 mg per day of olive leaf extract for 8 weeks significantly lowered blood pressure compared with lifestyle advice alone, while 500 mg per day had no clear effect on blood pressure.Food supplementation with an olive (Olea europaea L.) leaf extract reduces blood pressure in borderline hypertensive mon…
- In a placebo-controlled crossover trial of 37 adults with high-normal or borderline blood pressure, 500 mg olive leaf extract twice daily (with green coffee and beetroot extracts) for 6 weeks had no significant effect on 24-hour blood pressure or other measures compared with placebo.Antihypertensive potential of combined extracts of olive leaf, green coffee bean and beetroot: a randomized, double-blin…
- In 30 adults with essential hypertension, about 3 months of an aqueous olive leaf extract significantly lowered blood pressure, with only minor changes in blood tests and no side effects reported; the trial was small and the comparison with placebo was limited.[A clinical trial of a titrated Olea extract in the treatment of essential arterial hypertension].
- In an uncontrolled pilot of 663 adults with high blood pressure, 2 months of olive leaf and fruit extract (100 mg oleuropein and 20 mg hydroxytyrosol daily) lowered systolic and diastolic blood pressure by about 13 and 7 mmHg, with minor side effects in 3.2 percent.Supplementation Effect of a Combination of Olive (Olea europea L.) Leaf and Fruit Extracts in the Clinical Management of…
- In a preliminary study of pre-hypertensive and hypertensive volunteers taking 1600 mg per day of olive leaf extract, systolic and diastolic blood pressure decreased and nitric oxide rose, with improved LDL oxidation lag time.[HYPOTENSIVE EFFECT OF AN EXTRACT OF BIOACTIVE COMPOUNDS OF OLIVE LEAVES: PRELIMINARY CLINICAL STUDY].
- In 220 hypertensive adults in Algeria, drinking olive leaf infusion twice a day for six weeks was associated with significant reductions in systolic and diastolic blood pressure compared with a control group.Health status, risk factors and effects of olive leaf extract infusion (Olea europaea L.) on blood pressure in a hyperte…
- In 32 hypertensive patients taking a combination product (Ifanosine, 3.5 mg three times a day) for 30 days, systolic and diastolic blood pressure fell without serious side effects, though this uncontrolled observational study cannot establish cause.Ifanosine: Olea europaea L. and Hyphaene thebaica L. combination, from traditional utilization to rational formulation: …
- In a retrospective study of 30 adults with metabolic syndrome taking a quince, olive leaf and amaranth supplement for at least 12 weeks, total and LDL cholesterol fell, but blood pressure was not reported as an outcome.Retrospective Analysis of a Quince, Olive Leaf, and Amaranth Nutraceutical in Patients with Metabolic Syndrome.
Review Totals and Summary
Members Only2,600 reviews · 95% positive
Customers across several countries, including the US, Netherlands, Switzerland, the UK and Sweden, mostly describe Thorne Olive Leaf Extract as a trustworthy, high-quality product from a brand they already rely on. Many are repeat buyers who take it daily as an immune "guard", especially in cold and flu season. Several say it helps them get rid of cold symptoms quickly. Others value it for its antibacterial or antiviral reputation and describe it as a natural anti-inflammatory. A recurring theme is blood pressure. Some users report lowered readings after taking it, and they mention this as a main reason they keep buying it. Some reviewers say that many other olive leaf products "don't do anything" for them, and that Thorne's worked where those did not. That suggests they trust the standardization and the brand's quality control. Users describe the taste as mildly bitter but not unpleasant, and not strongly noticeable. Some mention a pleasant leafy olive smell. Shoppers who compare brands like the 18% oleuropein standardization. A few reviewers point to rival products with a higher oleuropein content per capsule or per daily serving. They say these offer more for the money, though they still speak well of Thorne. The main criticism is batch-to-batch inconsistency. One critical reviewer, who otherwise calls themself a big fan of Thorne, gave three stars because of it. They noted that the color and smell changed between bottles. They explained that other phenolic components can vary with the extraction process even when oleuropein is standardized. Other complaints are fewer and tend to be about price, or about the lack of any noticeable effect for some people. Overall, praise for quality, reliability and perceived immune and blood pressure benefits far outweighs the complaints, which centre on consistency and value.
Biohacker Summary
Members Only9 of 10 recommend it
Six panelists spoke about olive leaf extract, the main ingredient, and three of them clearly recommend it, while the other three were neutral. Those who recommend it mostly point to its antiviral use, especially against Epstein-Barr virus, colds and flu, and also name its antioxidant, anti-inflammatory, heart, brain and gut benefits, plus longevity and anti-aging. One panelist said he takes it himself, and another lists it as an ingredient in his own gut product and has also given it to a dog. Others in the neutral group mention it for immunity, antifungal action, boosting autophagy (the body's cell cleanup), and a plant compound called oleuropein, and one panelist simply discussed its potential benefits. For pairing, one panelist suggests combining it with other antiviral supplements, high-dose vitamin C and L-lysine, and another says it works best for chronic fatigue and fibromyalgia alongside stress reduction; no one gave a dose or a preferred form, and no one reported a caution or stopping.
See all 6 biohackers →Hide the biohackers
Dave Asprey · Olive Leaf · recommends
- Dave Asprey recommends olive leaf polyphenols for brain optimization and anti-aging, highlighting their role as powerful free radical scavengers.
- Highly recommends olive leaf polyphenols for longevity, cognitive function, and as free radical scavengers that attach to and help the body get rid of harmful substances like microplastics.
- Clarifies that he does take olive leaf extract, despite initially saying he doesn't take Oleo rope pain.
Dr. Mark Hyman · Olive Leaf · recommends
- Recommends pairing high-dose IV vitamin C and L-lysine with a lot of antiviral supplements, including olive leaf extract, to have as much antiviral fighting capacity on a daily basis as possible.
- Recommends olive leaf extract as a great source of antioxidants that inhibits AGEs, prevents heart attacks and plaque, is anti-inflammatory, and protects the brain.
- States that their product Gut Food contains olive leaf extract, which is an incredible polyphenol for helping boost good bacteria in the gut.
- States that olive leaf extract is an ingredient in Gut Food, which is a plant compound with a profound impact on the microbiome and has shown improvement across a spectrum of gut issues in clinical trials.
- Recommends olive leaf as a bitter herb with antiviral properties that helps drive out dampness.
- Recommends olive leaf, stating it is very bitter and helps drive out and has anti-viral properties.
- Recommends olive leaf for fighting viruses, noting its bitter taste and ability to drive out dampness and phlegm.
Dr. Eric Berg · Olive Leaf · recommends
- Recommends olive leaf extract as a remedy for viral infections.
- Recommends choosing one or two herbs, including olive leaf extract, to help inhibit EBV from coming out of remission.
- Recommends olive leaf extract as a natural herb that can help suppress viruses, especially the Epstein-Barr virus.
- Recommends olive leaf extract for myocarditis, noting it is anti-inflammatory and antiviral, and has shown significant benefit in research on autoimmune myocarditis.
- Recommends olive leaf extract as a potent antiviral, especially for Epstein-Barr virus, influenza, common cold, and other herpes viruses. It also helps balance cortisol, protect the heart, and has anti-cancer properties, particularly for breast and colorectal cancer. It works best for chronic fatigue syndrome and fibromyalgia when combined with stress reduction.
- Mentions olive leaf as one of several herbal remedies that could be used for symptoms related to latent viruses.
- Suggests taking olive leaf extract to boost immunity.
- Dr. Berg lists Olive Leaf Extract as one of the best remedies for infections.
- Dr. Berg listed Olive leaf extract as a remedy for mucus.
- Dr. Berg states that Olive Leaf Extract is one of a number of natural herbal remedies that can have the potential to reduce the pain and inflammation in your knees.
Ben Greenfield · Olive Leaf · neutral
- Includes olive leaf extract because it contains unique polyphenols, specifically oleuropein in higher proportions than in the fruit or oil, which has shown senolytic potential in tissues where other polyphenols were not active, supporting multiple tissues.
- Gives their dog intermittent olive leaf to help control a secondary staph infection.
- Notes that olive leaf extract mitigates EMF damage, probably due to NRF2 stimulation.
- Recommends olive leaf as a natural agent with anti-fungal properties.
- Brendon has increased his intake of olive leaf for immunity.
Siim Land · Olive Leaf · neutral
- Lists olive oil leaf extract as a food that can boost autophagy.
Dr. Rhonda Patrick · Olive Leaf · neutral
- Dr. Rhonda Patrick discusses the potential benefits of olive leaf extract.
RAL Summary
Members OnlyTier 2 for Blood Pressure
Large human studies, including a review of 30 trials with 1,726 people and a trial of 621 people, show a modest drop in blood pressure, and 95 percent of 2,600 reviews are positive, which meets tier 2.
Where the evidence disagrees: 6 of the 21 human studies found no effect.
More Details
Members OnlyBody systems · Combine with · Possible side effects
Body systems: Cardiovascular system
Combine with: For blood pressure support, olive leaf pairs well with magnesium (glycinate or taurate), potassium-rich foods, CoQ10 or ubiquinol, omega-3 fish oil (EPA/DHA), and garlic extract (aged). For the stated anti-aging and cellular repair goal, add compounds with better evidence such as NAD+ precursors (nicotinamide riboside or NMN), resveratrol or pterostilbene, quercetin plus fisetin for senescence support, alpha-lipoic acid, and PQQ for mitochondrial support, plus vitamin D3/K2 and adequate folate and B12 for DNA methylation. Consult a healthcare provider before combining with meds, since olive leaf may add to their effects and cause low blood pressure.
Possible side effects: No major side effects reported.
Supplement Facts
Olive leaf extract 500 mg
| Olive leaf extract | 500 mg | † |
Other ingredients: Hypromellose, Leucine, Silicon Dioxide.
Directions: Suggested use: Take 1 capsule two to three times daily or as recommended by your health-care practitioner.
Barcode (UPC) 693749763031 · Label source: NIH label database · Report a label change
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Graded November 5, 2026 by the Reverse Age Lab evidence engine, from human studies, real reviews and our biohacker panel. How we grade. Is this medical advice? No. Rala organizes the published evidence; go over any change with your doctor, especially if you take meds.
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