Plant Comparison
Olive vs Blackcurrant
A side-by-side comparison of two medicinal plants — every documented constituent, action, use, safety note and cited source, assembled automatically from the Omnia Sana database.
At a glance
Olive and Blackcurrant: they share 6 indicated uses (arthritis / joint pain, cardiovascular / heart health, cold & flu, …); 3 pharmacological actions in common.
Evidence face-off — shared uses
| Condition | Olive | Blackcurrant | Verdict |
|---|---|---|---|
| Arthritis / joint pain | 5/10 | 5/10 | Comparable evidence |
| Cardiovascular / heart health | 5/10 | 6/10 | Comparable evidence |
| Cold & flu | 5/10 | 5/10 | Comparable evidence |
| Infection (general) | 5/10 | 5/10 | Comparable evidence |
| Inflammation (general) | 5/10 | 5/10 | Comparable evidence |
| Skin irritation | 5/10 | 5/10 | Comparable evidence |
Evidence scores (1–10) are computed from the tier of each cited source. “Comparable” means the two scores are within one point. Follow a score to its detailed sources.
Key Constituents
The principal bioactive phenolics of the leaf, responsible for most of its antioxidant, anti-inflammatory and antihypertensive activity.
Antioxidant flavonoids of the leaf.
Pentacyclic triterpenes of the leaf cuticle and fruit skin, studied for anti-inflammatory and metabolic effects.
The dominant fatty acid of the fruit oil, a key component of the Mediterranean-diet lipid profile.
Give the berries their deep colour and are the principal antioxidant constituents.
The fruit is exceptionally rich in vitamin C, contributing to its traditional cold/flu use.
The seed oil is a well-known plant source of the omega-6 fatty acid GLA.
Pharmacological Actions
Traditional & Indicated Uses
inferred from anti-inflammatory action
inferred from antidiabetic action
inferred from anticancer action
inferred from antimicrobial action
inferred from anti-inflammatory action
inferred from antidiabetic action
inferred from anti-inflammatory action
inferred from anti-inflammatory action
inferred from antiviral action
inferred from anti-inflammatory action
inferred from anti-inflammatory action
inferred from diuretic action
inferred from diuretic action
Safety, Cautions & Contraindications
Olive leaf extract may lower blood pressure; use caution if already on antihypertensive medication. May have mild hypoglycaemic effects. Olive oil is safe for dietary use. Rare olive pollen allergy. Well tolerated in normal culinary and supplement doses.
Duke (2002) includes olive leaf as ++ and notes hypotensive, hypoglycemic, ACE inhibitor-like, and antioxidant activities at the experimental level (score 1). Olive leaf extract (containing oleuropein) has demonstrated blood pressure-lowering and antiarrhythmic effects consistent with clinical support (PHR). Duke notes that traditional Mediterranean use for both the leaf and fruit is food-grade and safe. Olive leaf preparations are used as mild antihypertensives in European phytotherapy. No significant adverse effects are reported at standard herbal doses (Duke, 2002).
Fruit (berries) • Generally safe as food for most people; adverse effects mainly GI discomfort or allergy in sensitive individuals. • If using high-dose extracts, use extra caution with blood-thinners/anticoagulants (evidence is not definitive, but polyphenol-rich supplements are often treated cautiously in practice). Leaf (folium) • EMA classifies blackcurrant leaf as a traditional herbal medicinal product (not “well-established use”): minor joint pain and urinary-tract flushing. • Typical label cautions (EMA-style): not recommended <18, avoid if you have edema due to impaired heart/kidney function, and seek medical advice if urinary symptoms persist/worsen. • Pregnancy/lactation: food use is fine, but medicinal leaf dosing is generally used cautiously due to limited robust safety data. Seed (seed oil) • Usually well tolerated, but may cause GI upset in some people. • Caution with anticoagulants/antiplatelet drugs (PUFA supplements are often used cautiously here). • Note: some trials explored maternal/infant contexts, but that does not automatically mean “recommended in pregnancy” outside medical supervision.
Duke (2002) rates blackcurrant fruit highly (+++), with evidence for anti-inflammatory, angioprotective, and antioxidant activities. Ribes nigrum extracts showed the richest anthocyanin and polyphenol content in antioxidant studies, outperforming many other common berries. Clinical use is supported for diarrhea, colds, and flu. The high vitamin C and anthocyanin content underpin its vasoprotective effects. The fruit is treated as food-grade medicine and is classified as generally safe (Duke, 2002).
External Ids
Botanical Description
Evergreen tree (Oleaceae), typically 3-15 m tall, often gnarled and long-lived, with some specimens surviving for centuries. Leaves are narrow, leathery, lance-shaped, dark green above and silvery-grey beneath. Small, fragrant, creamy-white four-lobed flowers are borne in axillary clusters, followed by a fleshy drupe (the olive) that ripens from green to purple-black.[1]
Deciduous shrub (Grossulariaceae), 1-2 m tall, aromatic when the leaves are crushed. Leaves are palmately lobed (3-5 lobes), toothed, with resinous glands on the underside. Small, greenish-white to dull purple, bell-shaped flowers are borne in drooping racemes, followed by clusters of glossy black berries.
Habitat
Native to the Mediterranean basin, the Near East and parts of Africa, and cultivated for millennia across Mediterranean-type climates worldwide (warm, dry summers and mild winters); tolerates poor, rocky, calcareous soils and drought.[1]
Native to central and northern Europe and Siberia, growing in damp woodland, fens, riverbanks and hedgerows; widely cultivated commercially as a fruit crop in cool-temperate climates.
Harvesting
Leaves can be harvested year-round from pruned or fallen branches, generally at their highest oleuropein content in late autumn and winter; fruit is hand- or machine-harvested from early autumn (green olives) through winter (fully ripe black olives), depending on the intended product.[10]
Berries are hand- or machine-harvested in mid- to late summer once fully ripe and black. Leaves are gathered in late spring to early summer, before flowering fades, for the medicinal leaf preparation. Seed oil is cold-pressed from the seeds after juicing.
Traditional Uses
Olive leaf and fruit have a long Mediterranean tradition as a tonic, antipyretic and mild antihypertensive remedy, and olive oil is the foundation fat of the traditional Mediterranean diet, long associated with cardiovascular health. Modern research on oleuropein and other leaf polyphenols supports antioxidant, anti-inflammatory, antimicrobial, blood-pressure-lowering and insulin-sensitising effects consistent with these traditional and dietary uses.[1, 4, 7]
Blackcurrant has a long northern-European food-medicine tradition: the vitamin-C- and anthocyanin-rich berries have traditionally been used for colds, flu and general vitality, while the leaf has an official EU traditional-use registration for minor joint pain and as a urinary-tract flush, and the seed oil is valued as a source of gamma-linolenic acid (GLA). Modern research confirms broad antioxidant, anti-inflammatory, immunomodulatory and vasoprotective activity across the fruit, leaf and seed oil.[11, 12, 13]
Preparations
Dosage
A meta-analysis of trials for blood pressure used around 500 mg/day of standardised olive leaf extract. Educational reference only, not a prescription; culinary olive oil and leaf tea are considered food-safe at normal dietary amounts.
EMA-style traditional-use guidance for the leaf suggests roughly 2-4 g dried leaf per cup as an infusion, up to three times daily, for short-term joint or urinary support (not recommended under 18, or with fluid retention linked to heart/kidney disease). Berries and juice are food-safe at normal dietary amounts. Educational reference only, not a prescription.
References
Drug Class Interactions
Not documented
Pairings
Olive leaf and black seed (Nigella sativa) can each mildly lower blood pressure, so taking them together — especially alongside blood-pressure medicines — may add up and lower blood pressure more than expected. Monitor your blood pressure.[11, 18]
Not documented
Lookalikes Review
References & Sources
- Omar, S.H., Kerr, P.G., Scott, C.J., Hamlin, A.S. and others (2017) 'Olive (Olea europaea L.) Biophenols: A Nutriceutical against Oxidative Stress in SH-SY5Y Cells', Molecules, 22(11), pp. 1858. doi:10.3390/molecules22111858 Preclinical
https://doi.org/10.3390/molecules22111858 - Ruzzolini, J., Peppicelli, S., Andreucci, E., Bianchini, F. and others (2018) 'Oleuropein, the Main Polyphenol of Olea europaea Leaf Extract, Has an Anti-Cancer Effect on Human BRAF Melanoma Cells and Potentiates the Cytotoxicity of Current Chemotherapies', Nutrients, 10(12), pp. 1950. doi:10.3390/nu10121950 Preclinical
https://doi.org/10.3390/nu10121950 - Al-Rimawi, F., Sbeih, M., Amayreh, M., Rahhal, B. and others (2024) 'Evaluation of the antibacterial and antifungal properties of oleuropein, Olea europaea leaf extract, and Thymus vulgaris oil', BMC Complementary Medicine and Therapies, 24(1), pp. 297. doi:10.1186/s12906-024-04596-x Preclinical
https://doi.org/10.1186/s12906-024-04596-x - Qabaha, K., Al-Rimawi, F., Qasem, A. and Naser, S.A (2018) 'Oleuropein Is Responsible for the Major Anti-Inflammatory Effects of Olive Leaf Extract', Journal of Medicinal Food, 21(3), pp. 302-305. doi:10.1089/jmf.2017.0070 Preclinical
https://doi.org/10.1089/jmf.2017.0070 - Pang, K.L., Lumintang, J.N. and Chin, K.Y (2021) 'Thyroid-Modulating Activities of Olive and Its Polyphenols: A Systematic Review', Nutrients, 13(2), pp. 529. doi:10.3390/nu13020529 Meta-analysis / review
https://doi.org/10.3390/nu13020529 - Kheirandish, F., Mosaffa, N., Tarahi, M.J. and Fallahi, S (2018) 'Olive (Olea europaea) leaf extract alters the cytokine profile of Leishmania major-infected macrophages: New insight into the underlying mechanism', Parasite Immunology, 40(4), pp. e12520. doi:10.1111/pim.12520 Preclinical
https://doi.org/10.1111/pim.12520 - de Bock, M., Derraik, J.G., Brennan, C.M., Biggs, J.B. and others (2013) 'Olive (Olea europaea L.) leaf polyphenols improve insulin sensitivity in middle-aged overweight men: a randomized, placebo-controlled, crossover trial', PLoS One, 8(3), pp. e57622. doi:10.1371/journal.pone.0057622 Randomized trial
https://doi.org/10.1371/journal.pone.0057622 - Pasban-Aliabadi, H., Esmaeili-Mahani, S., Sheibani, V., Abbasnejad, M. and others (2013) 'Inhibition of 6-hydroxydopamine-induced PC12 cell apoptosis by olive (Olea europaea L.) leaf extract is performed by its main component oleuropein', Rejuvenation Research, 16(2), pp. 134-142. doi:10.1089/rej.2012.1384 Preclinical
https://doi.org/10.1089/rej.2012.1384 - Imperatrice, M., Lasfar, A., van Kalkeren, C.A.J. and Troost, F (2024) 'Olive Leaf Extract Supplementation Improves Postmenopausal Symptoms: A Randomized, Double-Blind, Placebo-Controlled Parallel Study on Postmenopausal Women', Nutrients, 16(22), pp. 3879. doi:10.3390/nu16223879 Randomized trial
https://doi.org/10.3390/nu16223879 - de Bock, M., Thorstensen, E.B., Derraik, J.G., Henderson, H.V. and others (2013) 'Human absorption and metabolism of oleuropein and hydroxytyrosol ingested as olive (Olea europaea L.) leaf extract', Molecular Nutrition & Food Research, 57(11), pp. 2079-2085. doi:10.1002/mnfr.201200795 Preclinical
https://doi.org/10.1002/mnfr.201200795 - Ismail, M.A., Norhayati, M.N. and Mohamad, N (2021) 'Olive leaf extract effect on cardiometabolic profile among adults with prehypertension and hypertension: a systematic review and meta-analysis', PeerJ, 9, pp. e11173. doi:10.7717/peerj.11173 Meta-analysis / review
https://doi.org/10.7717/peerj.11173 - Boskov Hansen, H.C. et al (2012) 'Oleocanthal, a phenolic derived from virgin olive oil: a review of the beneficial effects on inflammatory disease', 13(9), pp. 11628--11670. doi:10.3390/ijms150712323 Traditional / reference
https://doi.org/10.3390/ijms150712323 - Wainstein, J. et al (2012) 'Olive leaf extract as a hypoglycemic agent in both human diabetic subjects and in rats', 15(7), pp. 605--610. doi:10.1089/jmf.2011.0243 Randomized trial
https://doi.org/10.1089/jmf.2011.0243 - Waterman, E. and Lockwood, B (2007) 'Active components and clinical applications of olive oil', 12(4), pp. 331--342. Preclinical
https://scholar.google.com/scholar?q=Active%20components%20and%20clinical%20applications%20of%20olive%20oil - Duke, J.A (2002) 'Handbook of Medicinal Herbs, Second Edition'. Traditional / reference
https://scholar.google.com/scholar?q=Handbook%20of%20Medicinal%20Herbs%2C%20Second%20Edition - de Bock, M., Derraik, J.G.B., Brennan, C.M., Biggs, J.B., Morgan, P.E., Hodgkinson, S.C., Hofman, P.L. and Cutfield, W.S (2013) 'Olive (Olea europaea L.) leaf polyphenols improve insulin sensitivity in middle-aged overweight men: a randomized, placebo-controlled, crossover trial', PLoS One, 8(3), pp. e57622. doi:10.1371/journal.pone.0057622 Randomized trial
https://doi.org/10.1371/journal.pone.0057622 - Willcox, M.L., Elugbaju, C., Al-Anbaki, M., Lown, M. and Graz, B (2021) 'Effectiveness of Medicinal Plants for Glycaemic Control in Type 2 Diabetes: An Overview of Meta-Analyses of Clinical Trials', Frontiers in Pharmacology, 12, pp. 777561. doi:10.3389/fphar.2021.777561 Meta-analysis / review
https://doi.org/10.3389/fphar.2021.777561 - Sahebkar, A., Soranna, D., Liu, X., Thomopoulos, C., Simental-Mendia, L.E., Derosa, G., Maffioli, P. and Parati, G (2016) 'A systematic review and meta-analysis of randomized controlled trials investigating the effects of supplementation with Nigella sativa (black seed) on blood pressure', Journal of Hypertension, 34(11), pp. 2127-2135. doi:10.1097/HJH.0000000000001049 Meta-analysis / review
https://doi.org/10.1097/HJH.0000000000001049
- Lee, Y., Pham, T.X., Bae, M., Hu, S. and others (2019) 'Blackcurrant (Ribes nigrum) Prevents Obesity-Induced Nonalcoholic Steatohepatitis in Mice', Obesity (Silver Spring), 27(1), pp. 112-120. doi:10.1002/oby.22353 Preclinical
https://doi.org/10.1002/oby.22353 - da Costa, P., Schetinger, M.R.C., Baldissarelli, J., Stefanello, N. and others (2024) 'Blackcurrant (Ribes nigrum L.) improves cholinergic signaling and protects against chronic scopolamine-induced memory impairment in mice', Journal of Psychopharmacology, 38(12), pp. 1170-1183. doi:10.1177/02698811241273776 Preclinical
https://doi.org/10.1177/02698811241273776 - Nanashima, N., Horie, K., Yamanouchi, K., Tomisawa, T. and others (2020) 'Blackcurrant (Ribes nigrum) Extract Prevents Dyslipidemia and Hepatic Steatosis in Ovariectomized Rats', Nutrients, 12(5), pp. 1541. doi:10.3390/nu12051541 Preclinical
https://doi.org/10.3390/nu12051541 - Lee, Y. and Lee, J.Y (2019) 'Blackcurrant (Ribes nigrum) Extract Exerts an Anti-Inflammatory Action by Modulating Macrophage Phenotypes', Nutrients, 11(5), pp. 975. doi:10.3390/nu11050975 Preclinical
https://doi.org/10.3390/nu11050975 - Lappi, J., Raninen, K., Vakevainen, K., Karlund, A. and others (2020) 'Blackcurrant (Ribes nigrum) lowers sugar-induced postprandial glycaemia independently and in a product with fermented quinoa: a randomised crossover trial', British Journal of Nutrition, 126(5), pp. 708-717. doi:10.1017/S0007114520004468 Randomized trial
https://doi.org/10.1017/S0007114520004468 - Horie, K., Maeda, H., Nanashima, N. and Oey, I (2021) 'Potential Vasculoprotective Effects of Blackcurrant (Ribes nigrum) Extract in Diabetic KK-Ay Mice', Molecules, 26(21), pp. 6459. doi:10.3390/molecules26216459 Preclinical
https://doi.org/10.3390/molecules26216459 - Nanashima, N., Horie, K., Kitajima, M., Takamagi, S. and others (2021) 'Hypocholesterolemic Effect of Blackcurrant (Ribes nigrum) Extract in Healthy Female Subjects: A Pilot Study', Molecules, 26(13), pp. 4085. doi:10.3390/molecules26134085 Clinical study
https://doi.org/10.3390/molecules26134085 - Horie, K., Nanashima, N., Maeda, H., Tomisawa, T. and others (2021) 'Blackcurrant (Ribes nigrum L.) Extract Exerts Potential Vasculoprotective Effects in Ovariectomized Rats, Including Prevention of Elastin Degradation and Pathological Vascular Remodeling', Nutrients, 13(2), pp. 560. doi:10.3390/nu13020560 Preclinical
https://doi.org/10.3390/nu13020560 - Oczkowski, M (2021) 'Health-promoting effects of bioactive compounds in blackcurrant (Ribes nigrum L.) berries', Roczniki Panstwowego Zakladu Higieny, 72(3), pp. 229-238. doi:10.32394/rpzh.2021.0174 Meta-analysis / review
https://doi.org/10.32394/rpzh.2021.0174 - Vagiri, M., Conner, S., Stewart, D., Andersson, S.C. and others (2015) 'Phenolic compounds in blackcurrant (Ribes nigrum L.) leaves relative to leaf position and harvest date', Food Chemistry, 172, pp. 135-142. doi:10.1016/j.foodchem.2014.09.041 Preclinical
https://doi.org/10.1016/j.foodchem.2014.09.041 - Gopalan, A., Reuben, S.C., Ahmed, S., Darvesh, A.S., Hohmann, J. and Bishayee, A (2012) 'The health benefits of blackcurrants', 3(8), pp. 795--809. doi:10.1039/c2fo30058c Randomized trial
https://doi.org/10.1039/c2fo30058c - Royal Botanic Gardens, Kew (n.d.). Available at: https://powo.science.kew.org Traditional / reference
https://powo.science.kew.org - Watson, A.W., Haskell-Ramsay, C.F., Kennedy, D.O., Dodd, F.L., Wightman, E.L. and Reay, J.L (2015) 'Acute supplementation with blackcurrant extracts modulates cognitive functioning and inhibits monoamine oxidase-B in healthy young adults', 54(3), pp. 505--513. Traditional / reference
https://scholar.google.com/scholar?q=Acute%20supplementation%20with%20blackcurrant%20extracts%20modulates%20cognitive%20functioning%20and%20inhibits%20monoamine%20oxidase-B%20in%20healthy%20young%20adults - Duke, J.A (2002) 'Handbook of Medicinal Herbs, Second Edition'. Traditional / reference
https://scholar.google.com/scholar?q=Handbook%20of%20Medicinal%20Herbs%2C%20Second%20Edition
Generated automatically from the Omnia Sana plant database and its cited sources. For educational purposes only — not medical advice. Always consult a qualified practitioner before using medicinal plants.