Oleuropein Dosage Guide: Protocols, Calculator & Safety
Everything you need to know about Oleuropein dosing — protocols, safety, and where to buy.
Dosage Calculator
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Dosing Protocols
Beginner Protocol (first 8–12 weeks): The cleanest, cheapest, and most evidence-aligned entry point is food-first. Replace cooking oils, butter, and salad dressing fats with high-polyphenol extra-virgin olive oil. Target 2–3 tablespoons per day (25–40 mL) of EVOO that meets these quality criteria: (1) single-cultivar or region-specified (Koroneiki from Greece, Picual or Arbequina from Spain, Coratina from Italy, Moraiolo from Tuscany are high-polyphenol cultivars); (2) early harvest date if specified on the label (early-October harvests in northern hemisphere are polyphenol-richest); (3) dark glass bottle (clear glass and plastic degrade polyphenols); (4) bottled within 12 months and consumed within 18 months of harvest; (5) ideally polyphenol content specified on the label (>400 mg/kg total polyphenols is a high-polyphenol EVOO; some premium brands now list oleocanthal/oleuropein specifically). Taste-test: high-polyphenol EVOO has a distinctive peppery bite at the back of the throat and may cause a single cough on swallowing — this is oleocanthal doing its COX-inhibitory thing. If your current EVOO tastes flat or buttery, it is probably low-polyphenol and worth replacing. Use EVOO raw — drizzle on salads, soups, cooked vegetables, eggs, bread; do not use for high-heat frying. Expected outcomes at the beginner level: no dramatic acute changes, but better overall Mediterranean-diet adherence, possible small BP reductions if baseline is elevated, and alignment with the EFSA polyphenol health claim (5 mg hydroxytyrosol-equivalents per 20 g olive oil).
If you prefer to add a supplement, start with olive leaf extract 500 mg once daily with food, standardized to 15–20% oleuropein content (providing 75–100 mg/day oleuropein). Give 6–8 weeks before evaluating effects on BP, lipids, or general wellbeing. Home BP monitoring 2x/day for a week before starting, repeated at weeks 6 and 8, is a practical way to detect the modest BP reduction that is the most common measurable effect.
Intermediate Protocol (weeks 8–24, specific indications): For stage-1 hypertension (130–140/80–90), olive leaf extract 500 mg twice daily with breakfast and dinner, combined with Mediterranean-diet EVOO intake (2–3 Tbsp/day), hesperidin 500 mg 2S-hesperidin, magnesium glycinate 300–400 mg, and dietary nitrate (beetroot juice 70 mL concentrate or dietary root vegetables daily). Home BP monitoring 2x/day with weekly averages tracked over 6–12 weeks. Expected systolic reduction: 8–12 mmHg across the stack. This can be used as first-line for grade 1 hypertension at the discretion of your physician, or as adjunctive to low-dose prescription antihypertensives.
For metabolic syndrome or prediabetes, add olive leaf extract 500 mg BID to Mediterranean-diet EVOO, berberine 500 mg TID with meals, curcumin 500 mg BID, omega-3 fish oil 1–2 g EPA+DHA, and a structured exercise program (150+ min/wk aerobic + 2x/wk resistance). Monitor quarterly HbA1c, fasting insulin, fasting glucose, HOMA-IR, full lipid panel.
For chronic low-grade inflammation (elevated hsCRP without other identifiable cause), olive leaf extract 500 mg + curcumin 500 mg phytosome/Meriva + omega-3 2 g + quercetin 500 mg + Mediterranean-diet EVOO. Repeat hsCRP at 8 and 16 weeks.
For post-viral fatigue or convalescence, olive leaf extract 500 mg BID + N-acetylcysteine 600 mg BID + CoQ10 100–200 mg + Mediterranean-diet EVOO + optional lion's mane 500 mg for cognitive recovery. Not a replacement for medical workup of persistent fatigue, but a reasonable nutritional supportive protocol.
For athletic recovery (endurance sports), switch to hydroxytyrosol direct supplementation 10–25 mg/day + high-polyphenol EVOO 3 Tbsp/day + tart cherry extract 500 mg post-training + omega-3 2 g + ensure adequate protein and micronutrient intake. Hydroxytyrosol direct dosing bypasses the variability of olive leaf extract and provides a known polyphenol dose for training-cycle periodization.
Advanced Protocol (6+ months, comprehensive longevity/cardiovascular optimization): Advanced users integrate oleuropein as one of several complementary polyphenol interventions within a broader longevity framework. Typical configuration: high-polyphenol EVOO 3 Tbsp/day (food matrix), olive leaf extract 500–1000 mg standardized to 15–20% oleuropein OR direct hydroxytyrosol 25–50 mg/day, combined with quercetin 500 mg, hesperidin 500 mg, pterostilbene 150 mg, apigenin 50 mg, spermidine 1–2 mg, NMN 500–1000 mg, L-citrulline 6 g, magnesium glycinate 400 mg, omega-3 2–3 g EPA+DHA, vitamin D3 2,000–5,000 IU with vitamin K2 MK-7 100 μg, and an appropriate creatine/protein/fiber foundation. This is a comprehensive polyphenol-NAD+-vascular stack that maps onto the PREDIMED + SIRT-activation + autophagy pathways simultaneously.
Measurement for advanced users: quarterly basic metabolic panel, lipid panel (including ApoB), hs-CRP, HbA1c, fasting insulin, and home BP averages. Annual ApoB/Lp(a), advanced lipid panel with particle sizes, flow-mediated dilation or pulse-wave velocity if available, and a structured body composition (DEXA) to track lean mass. Consider a CAC (coronary artery calcium) score every 3–5 years for cardiovascular risk stratification.
For users aiming to quantify their EVOO polyphenol intake precisely, several US/EU labs will run HPLC polyphenol analysis on an olive oil sample ($75–$200 per sample) providing mg/kg values for hydroxytyrosol, tyrosol, oleuropein, oleocanthal, and oleacein. The American/European EVOO producer associations (NAOOA, COI) certify polyphenol content on some premium products. Aim for >500 mg/kg total polyphenols for a therapeutic polyphenol delivery target.
For advanced users exploring oleocanthal specifically (the ibuprofen-analog), seek out ultra-premium early-harvest Coratina EVOO from southern Italy or high-phenolic Koroneiki from Greece with oleocanthal content >100 mg/kg on the label. These oils are expensive ($30–$60 per 500 mL) but deliver meaningful daily oleocanthal doses as a food. Several specialty producers (e.g., The Governor, Atsas Organics, certain Spanish producers) publish detailed polyphenol panels.
Cycling and rotation. Continuous daily EVOO intake is the evidence-aligned approach (it is a staple food). For supplemental olive leaf extract, some users prefer 8–12 week cycles followed by 2–4 week washout periods; the evidence base for cycling vs continuous use is thin, and continuous use at the doses typical in clinical trials is safe and probably correct for most users.
Integration with medications. If you are on antihypertensives, expect to need modest dose reductions as BP responds to the combined dietary and supplemental olive polyphenol intake. Coordinate with your prescribing physician. If you are on antidiabetics, monitor for hypoglycemia during the first 2–4 weeks. Warfarin users should check INR 2–3 weeks after starting high-dose olive leaf supplementation. DOAC users do not need formal monitoring.
Commonly Stacked With
Oleuropein stacks exceptionally well with other cardiovascular and anti-inflammatory polyphenols, and its dietary delivery vehicle (EVOO) is itself a food pattern rather than a pill, making it easy to integrate into routine meals.
Foundational Mediterranean-diet stack. The cleanest approach: replace butter, vegetable oils, and most other fats with high-polyphenol EVOO (2–3 Tbsp / 25–40 mL daily drizzled raw on food), increase non-starchy vegetables, moderate nuts (30 g/day mixed almonds/walnuts/hazelnuts), oily fish 2–3x/week, reduce red and processed meat. Add hesperidin 500 mg 2S-hesperidin for additive vascular effects or simply eat a citrus fruit daily. This pattern is PREDIMED-aligned and has a Level-1 cardiovascular evidence base.
Cardiovascular polyphenol stack. For users wanting supplemental-grade polyphenol diversity: EVOO daily as a food matrix, plus olive leaf extract 500–1000 mg standardized to 15–20% oleuropein, plus quercetin 500 mg, plus hesperidin 500 mg 2S-hesperidin, plus pterostilbene 100 mg OR resveratrol 150 mg, plus optionally EGCG 300 mg (separated from iron-rich meals). This covers secoiridoid, flavonol, flavanone, stilbene, and catechin subclasses.
Hypertension-focused stack. Olive leaf extract 500 mg BID + hesperidin 500 mg + L-citrulline 3–6 g + dietary nitrate 6–8 mmol/day (beetroot juice or root vegetables) + magnesium glycinate 300–400 mg + potassium from whole food. This is a well-evidenced non-pharmacologic BP stack. Layer under first-line antihypertensives as directed by your physician; monitor BP weekly for 4–6 weeks and adjust prescription doses downward if needed.
Inflammation and metabolic stack. Olive leaf extract 500 mg + curcumin 500 mg with piperine or phytosome formulation + omega-3 fish oil 1–2 g EPA+DHA + quercetin 500 mg + optional boswellia 300 mg for joint applications. This multi-pathway anti-inflammatory stack covers NF-κB (curcumin, HT), COX (oleocanthal from EVOO), and lipoxygenase (boswellia) pathways.
Athletic recovery stack. High-polyphenol EVOO 2–3 Tbsp daily + hydroxytyrosol 10–25 mg direct supplementation + tart cherry extract 500 mg post-training + omega-3 1–2 g + vitamin C 500 mg. Reduces exercise-induced oxidative stress and inflammatory response; modest effect on recovery biomarkers.
Longevity/healthspan stack. EVOO daily + olive leaf extract 500 mg + spermidine 1–2 mg + NMN or NR 500 mg + apigenin 50 mg + optional rapamycin under clinician supervision. Covers autophagy (spermidine), NAD+ (NMN/NR + apigenin CD38 inhibition), Mediterranean-diet cardiovascular benefit (EVOO), and mTOR (rapamycin).
Gut/immune stack. Olive leaf extract has mild antimicrobial activity and has historically been used for upper respiratory symptoms. Combine with N-acetylcysteine 600 mg BID, quercetin 500 mg, vitamin C 1–2 g, vitamin D3 2,000–5,000 IU, and zinc 25–50 mg during symptomatic periods.
What NOT to stack carelessly. Do not combine very high-dose olive leaf extract (>2 g/day) with aggressive antihypertensive regimens (4+ BP drugs) without monitoring — additive hypotension, especially orthostatic, is real at high doses. Do not combine high-dose olive leaf extract with tight glycemic management (multiple oral antidiabetics plus insulin) without glucose monitoring — modest hypoglycemia risk. Do not use olive leaf extract as a substitute for indicated prescription antihypertensives in stage-2 hypertension; it is an adjunct, not a replacement at standard supplemental doses.
Food-pairing strategy for EVOO. EVOO polyphenols are destroyed by high-temperature cooking (extended frying, deep-frying). For therapeutic polyphenol intake, use EVOO raw — drizzle on cooked food, use in dressings, finish soups and cooked vegetables. For sautéing, high-polyphenol EVOO can still be used but polyphenol content will decline with heat exposure above 180°C / 360°F. Pair EVOO with cooked tomato (lycopene synergy), with leafy greens (fat-soluble vitamin absorption), and with legumes (satiation and glycemic benefit).
Side Effects & Safety
Contraindications
Oleuropein as delivered by EVOO or standardized olive leaf extract has essentially no absolute contraindications, consistent with olive oil's status as a staple food with a >6,000-year history of human consumption. Cautions and relative contraindications: **Olive allergy.** True olive fruit allergy is rare but documented, often cross-reacting with olive pollen (a common aeroallergen in Mediterranean regions). If you have confirmed olive or olive-pollen allergy with systemic reactions, avoid olive leaf extract and high-dose EVOO; culinary EVOO use may be tolerated but should be discussed with an allergist. Mild oral allergy syndrome (lip tingling, perioral itching) with olives can occur without contraindication to supplement use. **Hypotension with concurrent antihypertensives.** Olive leaf extract modestly reduces BP (3–6 mmHg typical, up to 11/5 mmHg at therapeutic doses per Susalit 2011). If you are on multiple antihypertensive drugs, adding olive leaf extract may produce additive hypotension, particularly orthostatic in elderly patients. Start at 500 mg/day, monitor home BP daily for 2–4 weeks, and coordinate dose adjustments with your prescribing physician. Orthostatic symptoms (lightheadedness on standing) require dose reduction of either olive leaf or the prescription regimen. **Hypoglycemia with concurrent antidiabetics.** Modest glucose-lowering effects may add to insulin, sulfonylureas, or meglitinides. Monitor blood glucose during the first 2–4 weeks of olive leaf supplementation, particularly if you have frequent hypoglycemia episodes on your current regimen. **Pregnancy.** Dietary EVOO intake during pregnancy is universally safe and probably beneficial. Pharmacologic-dose olive leaf extract (>500 mg/day) during pregnancy has not been formally studied — avoid or discuss with an obstetrician. **Lactation.** Dietary EVOO intake is safe during lactation. Supplemental olive leaf extract lacks formal evaluation and is probably fine but should be discussed with your pediatrician, particularly in the first 3 months of breastfeeding. **Bleeding disorders and anticoagulation.** Weak anti-platelet activity at very high doses (>2 g/day olive leaf extract) may add to aspirin, NSAIDs, warfarin, or DOACs. Clinical signal is essentially zero at typical doses (500–1000 mg/day), but high-dose users on anticoagulation should monitor for bleeding tendencies and check warfarin INR 2–3 weeks after starting. **Surgery.** Stop high-dose olive leaf extract (>1 g/day) 7 days before major surgery as a general precaution. Dietary EVOO intake can continue. **Severe hypotension or decompensated heart failure.** Avoid adding olive leaf extract if you have borderline-low BP or are actively being titrated on multiple cardiac medications for decompensated heart failure. Wait until the acute regimen is stable, then discuss addition with your cardiologist. **Very rare case reports.** Occasional isolated reports of headache, dizziness (usually related to BP reduction), GI upset, or palpitations at high doses. No signal for hepatotoxicity, nephrotoxicity, hematologic toxicity, or carcinogenicity in the published olive leaf extract safety database, which covers thousands of patient-years at supplemental doses. **Not a replacement for indicated drug therapy.** Olive leaf extract is an adjunct, not a replacement, for prescription antihypertensives in stage-2 hypertension (140+/90+), for insulin in type-1 diabetes, for statin therapy in high-ASCVD-risk individuals with elevated ApoB, or for antibiotics in confirmed bacterial infections. It is a valid adjunct to prescription therapy with clinician coordination. **Drug interactions (minor).** Olive polyphenols are weak and clinically insignificant inhibitors of most CYP450 enzymes at supplemental doses. In contrast to grapefruit juice, EVOO and olive leaf do not meaningfully affect CYP3A4-metabolized drugs. Theoretical weak inhibition of P-glycoprotein and OATP1A2 at very high doses could marginally affect absorption of narrow-therapeutic-index drugs like digoxin or fexofenadine — space dosing by 2–4 hours as a simple hedge if you take one of these. **Red flags that warrant stopping.** New orthostatic symptoms, unexplained easy bruising or bleeding, new allergic symptoms (rash, urticaria), unexplained hypoglycemia in diabetics, or significant GI intolerance. In each case, stop the supplement and consult your clinician before resuming. **Not contraindicated but commonly confused:** Olive leaf extract is NOT the same as olive oil (the food), which has a different polyphenol profile and delivery matrix. It is also not the same as oleic acid or pure MCT oil. The grapefruit–drug interaction does NOT apply to olive oil or olive leaf, because olive products contain essentially no furanocoumarins. Do not confuse oleuropein with eugenol (from cloves) or with oleocanthal (related olive compound with different pharmacology).
Additional Notes
Oleuropein dosing is form-dependent, and the practical choice is among (1) dietary EVOO, (2) standardized olive leaf extract, (3) isolated hydroxytyrosol, or (4) whole-olive products.
(1) High-polyphenol extra-virgin olive oil. The PREDIMED-aligned intake is 50 mL/day (~4 Tbsp) of high-polyphenol Catalan EVOO, providing approximately 15 mg/day hydroxytyrosol-equivalents. For routine Mediterranean-diet use, 25–40 mL/day (2–3 Tbsp) of high-polyphenol EVOO is the usual target, delivering 5–12 mg/day hydroxytyrosol-equivalents — at or above the EFSA health-claim threshold. Polyphenol content varies enormously (50 mg/kg total polyphenols in low-quality EVOO vs 800+ mg/kg in premium early-harvest single-cultivar oils), so look for specified polyphenol content on labels of premium products, or choose cultivars and regions known for high polyphenols (Koroneiki/Greece, Picual/Spain, Coratina/Italy, Moraiolo/Tuscany, Arbequina/Catalonia).
(2) Standardized olive leaf extract. Typical clinical trial dosing is 500 mg twice daily of olive leaf extract standardized to 15–20% oleuropein content, providing 150–200 mg/day oleuropein (and converting to ~75–100 mg/day absorbed hydroxytyrosol). This is the dose used in the Susalit 2011 hypertension trial. Higher doses (1000 mg BID) are used in some inflammation and metabolic trials. Morning and evening dosing with meals is standard. Choose products that specify oleuropein percentage explicitly — non-standardized olive leaf products vary widely in content.
(3) Isolated hydroxytyrosol. Direct hydroxytyrosol supplementation bypasses the hydrolysis step and gives a known absorbed dose. Typical dose range: 10–50 mg/day. Branded hydroxytyrosol ingredients include Hytolive (Genosa), Benolea (Frutarom), and several olive-leaf-derived HT isolates. This form is priced at a premium but provides superior dose control and is particularly useful for athletic-performance applications where precise polyphenol dosing around training cycles is desired.
(4) Whole olives. Table olives (particularly naturally-fermented Greek, Spanish, or Italian varieties) deliver modest oleuropein and hydroxytyrosol amounts (typically 5–30 mg per 30 g serving), alongside healthy fats and trace minerals. Lye-cured black table olives have the lowest polyphenol content; naturally-fermented green olives and water-cured varieties retain more. Olives are an excellent Mediterranean-diet component but not a primary therapeutic polyphenol source at typical intakes.
Timing. With meals is standard, to improve GI tolerance and provide a lipid matrix for the lipophilic aglycone hydroxytyrosol metabolites. For EVOO, spread across 2–3 meals rather than concentrated at one meal, ideally including a breakfast dose for circadian alignment with early morning oxidative stress.
Duration and cycling. Continuous daily use is the evidence-aligned pattern — consistent with a dietary polyphenol source. Olive leaf extract cycling (8–12 weeks on, 2–4 weeks off) is used by some practitioners but lacks evidence of superiority over continuous dosing. For athletic performance, a pre-event 4–6 week loading block with hydroxytyrosol 25 mg/day can be used, followed by maintenance at 10 mg/day or transition to dietary EVOO only.
Ceiling dose. The highest olive leaf extract dose used in clinical trials is 2 g/day for 8–12 weeks without meaningful adverse-event signals. Dietary EVOO intake of 60–80 mL/day (the Cretan longevity cohort intake) is well-tolerated long-term. Direct hydroxytyrosol at doses up to 100 mg/day has been studied short-term without safety concerns, though benefits flatten above 25–50 mg/day.
Quality indicators. For EVOO: dark glass bottle, harvest date specified (not just "best by"), single cultivar or region, third-party certification (NAOOA, COI, DOP/PDO indicators), ideally polyphenol content specified. For olive leaf extract: standardized oleuropein percentage (15–20%), GMP-certified manufacturing, third-party testing (USP, NSF, ConsumerLab), clear specification of olive leaf Olea europaea as the source. For hydroxytyrosol: branded HT ingredient (Hytolive, Benolea), standardized content, high-purity (>99% HPLC).
Practical combinations. Many commercial products combine olive leaf extract with other cardiovascular ingredients (hawthorn berry, CoQ10, garlic extract) — these can be convenient but may underdose each component. Single-ingredient olive leaf extract at an evidence-based dose (500 mg BID standardized to 15–20% oleuropein) is usually cheaper and more precisely dosable than combination products.
Frequently Asked Questions
What is the recommended Oleuropein dosage?
Dosage for Oleuropein varies by protocol. Consult a qualified healthcare provider.
How often should I take Oleuropein?
Administration frequency depends on the specific protocol. Consult current research literature.
Does Oleuropein need to be cycled?
Cycling requirements depend on the protocol. Follow established research guidelines.
What are Oleuropein side effects?
Oleuropein — delivered as EVOO or as standardized olive leaf extract — has one of the best safety profiles of any bioactive polyphenol, consistent with olive oil's status as a staple food across the Mediterranean for >6,000 years. The adverse-event profile in clinical trials has been largely indistinguishable from placebo at the doses studied. **Gastrointestinal.** The most commonly reported side effects in olive leaf extract trials are mild GI complaints — occasional dyspepsia, nausea, abdominal cramping, or loose stools, each reported in <5% of participants and largely resolving within the first 1–2 weeks of supplementation or by taking with food. Very high doses of olive leaf extract (>2 g/day of 20% oleuropein extract, i.e., >400 mg/day oleuropein) may produce more pronounced GI effects. EVOO itself is extremely well-tolerated; the most common complaint is palate fatigue from the bitter-pungent polyphenol notes. **Hypotension and antihypertensive additivity.** Because oleuropein/hydroxytyrosol produces modest BP reductions, there is a theoretical additive hypotensive effect when combined with prescription antihypertensives (ACE inhibitors, ARBs, calcium-channel blockers, thiazide diuretics, beta-blockers). The Susalit 2011 captopril-comparator data suggest olive leaf extract in the 1 g/day range produces BP reductions of ~11/5 mmHg, which would stack with prescription drugs. Monitor home BP during the first 2–4 weeks of combined therapy and consult your physician about potential antihypertensive dose reduction if BP trends substantially low. Rarely, orthostatic hypotension has been reported at high olive leaf extract doses in elderly patients. **Antidiabetic additivity.** Similarly, the modest glucose-lowering activity of olive leaf extract may add to prescription antidiabetics. Users on insulin, sulfonylureas, or meglitinides should monitor for hypoglycemia during the first few weeks of combined therapy, though clinically meaningful hypoglycemia attributable to olive leaf is rare. **Bleeding and anticoagulation.** Olive polyphenols have weak anti-platelet activity, and at very high doses (>2 g/day of olive leaf extract, or >100 mL/day of very-high-polyphenol EVOO) combined with aspirin, NSAIDs, warfarin, or DOACs, there is a theoretical additive bleeding risk. Clinical signal is essentially zero in the PREDIMED safety data and in general olive leaf extract trials. If you take warfarin, an INR check 2–3 weeks after starting high-dose olive leaf supplementation is reasonable. DOAC users do not need monitoring but should mention the supplement to their prescriber. **Pregnancy and lactation.** Dietary EVOO intake during pregnancy is universally considered safe and probably beneficial — it is a staple food across Mediterranean pregnancies. Olive leaf extract at pharmacologic doses has not been formally evaluated in pregnancy and should be avoided or discussed with an obstetrician. Lactation: trace olive polyphenols appear in breast milk after dietary intake with no documented harm; supplemental olive leaf use during lactation should be clinician-supervised. **Allergies.** Olive pollen allergy is common in Mediterranean populations and can occasionally cross-react with olive fruit (oral allergy syndrome). True allergy to olive oil or to isolated olive polyphenols is very rare. If you have a documented olive pollen allergy or a history of reactions to olives, skin-test a small dose of olive leaf extract or consult an allergist before regular use. **Iron absorption.** Like other polyphenols, oleuropein and hydroxytyrosol can chelate non-heme iron and reduce dietary iron absorption if taken simultaneously with iron-rich meals. For non-anemic adults, this is clinically insignificant. If you have iron-deficiency anemia, avoid taking olive leaf extract within 1 hour of iron supplements or high-iron meals. **Drug interactions.** No major clinically significant drug interactions are documented. Olive polyphenols have minimal effect on CYP450 enzymes at dietary doses, and at supplemental doses the effect is weak and inconsistent. In contrast to grapefruit juice, EVOO and olive leaf do not significantly inhibit CYP3A4. **Hepatic and renal safety.** Olive leaf extract has no documented hepatotoxicity or nephrotoxicity at any dose studied in clinical trials, and it does not appear on the LiverTox database or the HDS hepatotoxicity watchlists. This is in contrast to [EGCG](/compound/egcg) at very high doses or to some herbal products. **Pediatric use.** Dietary EVOO intake is obviously appropriate for children of any age. Supplemental olive leaf extract in pediatrics lacks formal evaluation and should be clinician-supervised. **Surgery.** Stop high-dose olive leaf extract (>1 g/day) 7 days before major surgery as a precaution against theoretical anti-platelet additivity. Dietary EVOO intake can continue through the perioperative period without concerns. **Rare adverse events.** Isolated case reports of headache and dizziness at high olive leaf extract doses, presumably related to the modest BP-lowering effect. No signal for hepatic, renal, hematologic, or carcinogenic adverse events in the clinical-trial safety database. **Product quality risks.** The main practical safety issue with oleuropein supplementation is product quality variability — cheap, non-standardized olive leaf extracts may contain unpredictable oleuropein content, and some commercial products have been found on third-party testing to contain far less oleuropein than label claim. For EVOO, adulteration (dilution with refined or seed oils, or fraudulent labeling of low-polyphenol oils as "extra virgin") is a well-documented global problem. Buy from reputable sources, look for third-party certification (NSF, USP, NAOOA for olive oil), and favor single-cultivar EVOO with specified harvest dates.
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