Plant Comparison

Olive vs Dandelion

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.

First plant
Second plant
Show:
Plant AOliveOlea europaeaOleaceaeFull monograph →
Plant BDandelionTaraxacum officinaleAsteraceaeFull monograph →

At a glance

Olive and Dandelion: they share 7 indicated uses (arthritis / joint pain, cancer (anticancer research), cardiovascular / heart health, …); 5 pharmacological actions in common.

OliveDandelion
Constituents44
Pharmacological actions616
Indicated uses1017
Safety notes25
Cited sources1856
Indicated uses
Only Olive
Blood sugar / diabetes supportCold & fluMetabolic support
Shared (7)
Arthritis / joint painCancer (anticancer research)Cardiovascular / heart healthInfection (general)Inflammation (general)Skin irritationWounds
Only Dandelion
Loss of appetiteBloatingConstipationDetox / cleansingIndigestionLiver supportSwelling / fluid retentionUrinary supportUrinary tract infection (UTI)Immune support
Pharmacological actions
Only Olive
Antidiabetic (blood-sugar lowering)
Shared (5)
Anti-inflammatoryAnticancer (preclinical)AntimicrobialAntioxidantAntiviral
Only Dandelion
Bitter digestive tonic / stomachicCholeretic / cholagogue (bile flow)Digestive aidDiureticHepatoprotective (liver support)LaxativePrebioticLipid-loweringImmunomodulator / immune supportNeuroprotective / cognition supportAntihypertensive

Evidence face-off — shared uses

ConditionOliveDandelionVerdict
Arthritis / joint pain5/101/10Stronger for Olive
Cancer (anticancer research)2/102/10Comparable evidence
Cardiovascular / heart health5/102/10Stronger for Olive
Infection (general)5/101/10Stronger for Olive
Inflammation (general)5/101/10Stronger for Olive
Skin irritation5/101/10Stronger for Olive
Wounds5/101/10Stronger for Olive

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

Oleuropein and hydroxytyrosol (secoiridoid phenols)[2, 10]

The principal bioactive phenolics of the leaf, responsible for most of its antioxidant, anti-inflammatory and antihypertensive activity.

Phenolic compounds
Flavonoids (luteolin, apigenin, rutin)[1]

Antioxidant flavonoids of the leaf.

LuteolinApigeninRutinFlavonoids
Triterpenes (oleanolic acid, maslinic acid)[1]

Pentacyclic triterpenes of the leaf cuticle and fruit skin, studied for anti-inflammatory and metabolic effects.

Terpenes / terpenoids
Squalene and monounsaturated fatty acids (oleic acid)[1]

The dominant fatty acid of the fruit oil, a key component of the Mediterranean-diet lipid profile.

Sesquiterpene lactones[20, 50, 51]

Bitter principles (e.g. taraxacin) responsible for the characteristic bitterness and bitter-tonic action.

Sesquiterpene lactonesSesquiterpenes
Triterpenes and plant sterols[50, 52]

Including taraxasterol; contribute to anti-inflammatory and hepatoprotective signals.

Terpenes / terpenoidsPhytosterols
Phenolic acids and flavonoids[17, 21, 22, 52, 53]

Antioxidant constituents (e.g. chicoric acid, luteolin derivatives).

Phenolic acidsFlavonoidsLuteolin
Inulin[50, 53]

Fructan storage carbohydrate; prebiotic fibre concentrated in the autumn root.

PolysaccharidesInulin

Pharmacological Actions

Anti-inflammatory[1, 4, 6, 12, 13, 14]
Anticancer (preclinical)[2]
Antidiabetic (blood-sugar lowering)[7, 12, 13, 14]
Antimicrobial[3, 6, 12, 13, 14]
Antioxidant[1, 8, 12, 13, 14]
Antiviral[12, 13, 14]
Anti-inflammatory[14, 15, 16, 22, 25, 26, 30, 43, 44, 50, 52]
Parts: Whole plant
Anticancer (preclinical)[18, 23, 27, 28, 35, 36, 37, 38, 39, 40, 41]
Antimicrobial[32, 52]
Parts: Whole plant
Antioxidant[16, 21, 23, 28, 31, 52, 53]
Parts: Whole plant
Bitter digestive tonic / stomachic[50, 54]
Parts: Leaf
Choleretic / cholagogue (bile flow)[50, 51]

Choleretic (stimulates bile flow)

Parts: Leaf, Root
Digestive aid[50, 54]
Parts: Leaf
Diuretic[47, 50, 51, 55]

Diuretic (potassium-sparing)

Parts: Leaf
Hepatoprotective (liver support)[15, 25, 29, 42, 50, 51, 53]

Hepatic (liver) support

Parts: Root
Laxative[50, 54]
Parts: Root
Prebiotic[50, 53]

Prebiotic (inulin-rich, especially autumn root)

Parts: Root
Lipid-lowering[31, 34]
Antiviral[42]
Immunomodulator / immune support[43, 45]
Neuroprotective / cognition support[44]
Antihypertensive[46]

Traditional & Indicated Uses

Arthritis / joint pain[12, 13, 14]Moderate · 5/10

inferred from anti-inflammatory action

Evidence: 5
Label: Arthritis / joint pain
Blood sugar / diabetes support[7, 12, 13, 14]Moderate · 6/10

inferred from antidiabetic action

Evidence: 6
Label: Blood sugar / diabetes support
Cancer (anticancer research)[2]Traditional · 2/10

inferred from anticancer action

Evidence: 2
Label: Cancer (anticancer research)
Cardiovascular / heart health[12, 13, 14]Moderate · 5/10
Evidence: 5
Label: Cardiovascular / heart health
Cold & flu[12, 13, 14]Moderate · 5/10

inferred from antiviral action

Evidence: 5
Label: Cold & flu
Infection (general)[12, 13, 14]Moderate · 5/10

inferred from antimicrobial action

Evidence: 5
Label: Infection (general)
Inflammation (general)[4, 12, 13, 14]Moderate · 5/10

inferred from anti-inflammatory action

Evidence: 5
Label: Inflammation (general)
Metabolic support[12, 13, 14]Moderate · 5/10

inferred from antidiabetic action

Evidence: 5
Label: Metabolic support
Skin irritation[12, 13, 14]Moderate · 5/10

inferred from anti-inflammatory action

Evidence: 5
Label: Skin irritation
Wounds[12, 13, 14]Moderate · 5/10

inferred from antimicrobial action

Evidence: 5
Label: Wounds
Loss of appetite[50, 54]Traditional · 1/10

inferred from bitter-tonic action

Evidence: 1
Label: Loss of appetite
Arthritis / joint pain[50, 52]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1
Label: Arthritis / joint pain
Bloating[50, 54]Traditional · 1/10

inferred from digestive action

Evidence: 1
Label: Bloating
Cancer (anticancer research)[18, 23, 27, 35]Traditional · 2/10

inferred from anticancer action

Evidence: 2
Label: Cancer (anticancer research)
Constipation[50, 54]Traditional · 1/10

inferred from laxative action

Evidence: 1
Label: Constipation
Detox / cleansing[50, 51, 53]Traditional · 1/10

inferred from hepatoprotective action

Evidence: 1
Label: Detox / cleansing
Indigestion[50, 54]Traditional · 1/10

inferred from bitter-tonic action

Evidence: 1
Label: Indigestion
Infection (general)[52]Traditional · 1/10

inferred from antimicrobial action

Evidence: 1
Label: Infection (general)
Inflammation (general)[50, 52]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1
Label: Inflammation (general)
Liver support[50, 51]Traditional · 1/10

inferred from choleretic action

Evidence: 1
Label: Liver support
Skin irritation[50, 52]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1
Label: Skin irritation
Swelling / fluid retention[50, 51, 55]Moderate · 5/10

inferred from diuretic action

Evidence: 5
Label: Swelling / fluid retention
Urinary support[50, 51, 55]Moderate · 5/10

inferred from diuretic action

Evidence: 5
Label: Urinary support
Urinary tract infection (UTI)[50, 51, 55]Moderate · 5/10

inferred from diuretic action

Evidence: 5
Label: Urinary tract infection (UTI)
Wounds[52]Traditional · 1/10

inferred from antimicrobial action

Evidence: 1
Label: Wounds
Cardiovascular / heart health[31, 46]Traditional · 2/10

Dandelion root and leaf lowered serum lipids and oxidative stress (preclinical).

Evidence: 2
Label: Cardiovascular / heart health
Immune support[43, 45]Traditional · 2/10

Taraxasterol modulated the inflammatory/immune response in endotoxic shock (preclinical).

Evidence: 2
Label: Immune support

Safety, Cautions & Contraindications

Safety note[12, 13, 14]Caution

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.

Safety note[12, 13, 14, 15]Info

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).

Safety note[54, 56]Info

Allergy risk in individuals sensitive to Asteraceae (daisy family) plants such as ragweed and chamomile.

Safety note[54]Caution

Avoid medicinal use in anyone with a blocked bile duct or gallstones; use caution with gallbladder or serious liver disease.

Safety note[54, 56]Caution

May potentiate prescription diuretics; possible interactions with lithium and drugs metabolised by the liver.

Safety note[51, 54]Info

Can accumulate soil pollutants and heavy metals; harvest from clean, unpolluted sites.

Safety note[54]Caution

Use during pregnancy or breastfeeding should be guided by a qualified practitioner. Herbal use should support, not replace, conventional medical care.

External Ids

Gbif: 5415040
Wikidata: Q37083
Gbif: 5394163
Wikidata: Q131219

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]

Height: 3-15 m
Habit: Evergreen tree, often gnarled and long-lived
Leaves: Narrow, leathery, lance-shaped, dark green above, silvery-grey beneath
Flowers: Small, fragrant, creamy-white, four-lobed, in axillary clusters
Stem: Woody, often gnarled trunk
Root: Extensive woody root system
Fruit: Fleshy drupe (the olive), ripening from green to purple-black
Flowering Period: Late spring to early summer (May-June)

Perennial herb (Asteraceae) with a deep taproot, forming a basal rosette of deeply toothed, lance-shaped leaves - the name 'dandelion' comes from the French 'dent-de-lion', lion's tooth. Hollow flowering stalks each bear a single, bright yellow composite flower head made entirely of ray florets, followed by the familiar spherical 'clock' of parachute-tufted seeds (achenes) that disperse on the wind.[50]

Height: Low rosette; flowering stalks 5-40 cm
Habit: Deep-taprooted perennial rosette herb
Leaves: Deeply toothed, lance-shaped, in a basal rosette
Flowers: Single, bright yellow composite head of ray florets, on a hollow stalk
Stem: Hollow flowering stalk (scape), leafless
Root: Deep taproot
Fruit: Small achenes with a parachute-like pappus (the "clock")
Flowering Period: Can flower almost year-round, peaking March-October

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 Europe and Asia, now a cosmopolitan weed found on every continent except Antarctica; grows in lawns, meadows, roadsides, waste ground and disturbed soil of almost any type.[50]

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]

Parts: Leaf, Fruit
Season: Leaf year-round (peak late autumn/winter); fruit autumn to winter

Leaves are picked young in spring for the mildest flavour; the root is dug in autumn (traditionally after the first frost), when its inulin and bitter-principle content is considered optimal; flowers are picked as they open.[50, 53]

Parts: Leaf, Root, Flower
Season: Leaf in spring; root in autumn; flower as it opens

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]

Dandelion is one of the most widely used bitter tonic herbs worldwide, traditionally taken as a digestive bitter and mild diuretic - the French name 'pissenlit' (wet-the-bed) reflects this - and the root specifically as a liver and gallbladder tonic. Every part is also used as food: spring greens, roasted-root coffee substitute, and flower wine.[50]

Preparations

Standardised leaf extract[7, 9]

Capsule or liquid extract standardised for oleuropein content - the form used in most clinical trials.

Leaf infusion/salad (fresh or dried)[50]

Fresh young leaves eaten as a bitter salad green, or dried leaf infused as tea - the traditional digestive/diuretic preparation.

Root decoction[50]

Dried root simmered in water - the traditional liver-tonic preparation.

Dosage

Standardised leaf extract[11]

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.

Leaf/root infusion or decoction[50, 54]

Traditional guidance suggests roughly 4-10 g dried leaf, or 2-8 g dried root, per day as an infusion or decoction, divided into 2-3 doses. Educational reference only, not a prescription; avoid in bile-duct obstruction or gallstones, and harvest away from polluted ground.

References

REF-1437, REF-1438, REF-1439, REF-1440, REF-1441, REF-1442, REF-1443, REF-1444, REF-1445, REF-1446
REF-0248, REF-0320, REF-0322, REF-0323, REF-0324, REF-0325, REF-0327, REF-0330, REF-0331, REF-0334, REF-0335, REF-0336, REF-0337, REF-2387, REF-2388, REF-2389, REF-2390, REF-2391, REF-2392, REF-2393, REF-2394, REF-2395, REF-2396, REF-2945, REF-2946, REF-2947, REF-2948, REF-2949, REF-2950, REF-2951, REF-2952, REF-2953, REF-2954, REF-2955, REF-2956, REF-2957, REF-2958, REF-2959, REF-2960, REF-2961, REF-2962, REF-2963, REF-2964, REF-2965, REF-2966, REF-2967, REF-2968, REF-0070, REF-0264

Drug Class Interactions

Safety note[16, 17]Caution
Drug Class: antidiabetics
Mechanism: Olive leaf improves insulin sensitivity and glucose handling; combined with diabetes medicines it may add to blood-sugar lowering, so monitor blood sugar.
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-03
Safety note[11]Caution
Drug Class: antihypertensives
Mechanism: Olive leaf can modestly lower blood pressure - a meta-analysis found about a 6 mmHg fall in systolic pressure at 500 mg/day, though the evidence base is small. Combined with blood-pressure medicines it may add to their effect, so monitor your blood pressure.
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-03

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]

Partner Id: nigella-sativa
Type: caution
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-03

Not documented

Lookalikes Review

Outcome: none-known
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-07
Outcome: none-known
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-07

References & Sources

  1. 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
  2. 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
  3. 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
  4. 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
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  5. 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
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  6. 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
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  7. 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
  8. 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
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  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
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    https://powo.science.kew.org
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    https://bsbi.org/identification/taraxacum
  3. Farm and Dairy (2021) 'How to harvest and use dandelion roots, leaves and flowers'. Available at: https://www.farmanddairy.com/news/top-stories/how-to-harvest-and-use-dandelion-roots-leaves-and-flowers/656605.html Traditional / reference
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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.