Plant Comparison

Cowslip vs Sweet Violet

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

Plant ACowslipPrimula verisPrimulaceaeFull monograph →

Plant BSweet VioletViola odorataViolaceaeFull monograph →

At a glance

Cowslip and Sweet Violet: they share 5 indicated uses (arthritis / joint pain, inflammation (general), insomnia / sleeplessness, …); 2 pharmacological actions in common.

CowslipSweet Violet

Constituents23

Pharmacological actions35

Indicated uses511

Safety notes22

Cited sources1616

Indicated uses

Only Cowslip

none

Shared (5)

Arthritis / joint painInflammation (general)Insomnia / sleeplessnessRespiratory supportSkin irritation

Only Sweet Violet

AsthmaBronchitisCancer (anticancer research)CoughHeadacheSore throat

Pharmacological actions

Only Cowslip

Antioxidant

Shared (2)

Anti-inflammatorySedative / sleep support

Only Sweet Violet

Anticancer (preclinical)Demulcent (soothing mucilage)Expectorant

Evidence face-off — shared uses

Condition	Cowslip	Sweet Violet	Verdict
Arthritis / joint pain	1/10	1/10	Comparable evidence
Inflammation (general)	1/10	1/10	Comparable evidence
Insomnia / sleeplessness	1/10	6/10	Stronger for Sweet Violet
Respiratory support	7/10	6/10	Comparable evidence
Skin irritation	1/10	5/10	Stronger for Sweet Violet

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

Triterpene saponins (primulic acid)^[9]

Concentrated in the root; responsible for the traditional expectorant (secretolytic) action.

Triterpene saponins

Phenolic glycosides and flavonoids^{[2, 4]}

Found mainly in the flowers and leaves; contribute antioxidant activity.

Phenolic compoundsFlavonoidsGlycosides

Mucilage and saponins^[11]

Mucilage gives the soothing demulcent action; saponins give the expectorant action.

MucilageSaponins

Flavonoids and salicylic acid^{[2, 11]}

Antioxidant and mild analgesic constituents.

Flavonoids

Alkaloids (e.g. violine) and essential oil^[11]

Minor aromatic and bioactive constituents.

Essential (volatile) oilAlkaloids

Pharmacological Actions

Anti-inflammatory^{[11, 12, 13]}

Antioxidant^{[2, 3, 4, 7, 10, 11, 12, 13]}

Sedative / sleep support^{[11, 12, 13]}

Anti-inflammatory^{[1, 4, 11]}

Anticancer (preclinical)^{[3, 10]}

Demulcent (soothing mucilage)^{[1, 11, 12]}

Demulcent / expectorant for cough, bronchitis and catarrh (mucilage soothes; saponins loosen mucus) - a double-blind RCT found violet-flower syrup, added to standard treatment, sped cough suppression in children with asthma

Expectorant^{[1, 6, 11, 12]}

Sedative / sleep support^{[1, 7, 8, 9, 11]}

Mild sedative for sleeplessness and to ease headache (traditional)

Traditional & Indicated Uses

Arthritis / joint pain^{[11, 12, 13]}Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1

Label: Arthritis / joint pain

Inflammation (general)^{[11, 12, 13]}Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1

Label: Inflammation (general)

Insomnia / sleeplessness^{[11, 12, 13]}Traditional · 1/10

inferred from sedative action

Evidence: 1

Label: Insomnia / sleeplessness

Respiratory support^{[1, 2, 5, 9, 11, 12, 13]}Good · 7/10

Evidence: 7

Label: Respiratory support

Skin irritation^{[11, 12, 13]}Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1

Label: Skin irritation

Arthritis / joint pain^[11]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1

Label: Arthritis / joint pain

Asthma^{[11, 12]}Moderate · 5/10

Evidence: 5

Label: Asthma

Bronchitis^{[11, 12]}Moderate · 5/10

Evidence: 5

Label: Bronchitis

Cancer (anticancer research)^{[3, 10]}Traditional · 2/10

inferred from anticancer action

Evidence: 2

Label: Cancer (anticancer research)

Cough^{[11, 12]}Moderate · 5/10

Evidence: 5

Label: Cough

Headache^[11]Traditional · 1/10

Mild sedative for sleeplessness and to ease headache (traditional)

Evidence: 1

Label: Headache

Inflammation (general)^[11]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1

Label: Inflammation (general)

Insomnia / sleeplessness^{[8, 9, 11]}Moderate · 6/10

Mild sedative for sleeplessness and to ease headache (traditional)

Evidence: 6

Label: Insomnia / sleeplessness

Respiratory support^{[6, 11, 12]}Moderate · 6/10

inferred from expectorant action

Evidence: 6

Label: Respiratory support

Skin irritation^{[5, 11, 12]}Moderate · 5/10

inferred from demulcent action

Evidence: 5

Label: Skin irritation

Sore throat^[11]Traditional · 1/10

Evidence: 1

Label: Sore throat

Safety, Cautions & Contraindications

Safety note^{[11, 12, 13]}Caution

Allergy risk: avoid if you’re allergic to cowslip/other Primula species (European Medicines Agency, 2012). Stomach sensitivity: use caution if you have gastritis or a stomach ulcer—cowslip can upset the stomach in some people (European Medicines Agency, 2012). Possible side effects (especially high dose): nausea, vomiting, diarrhea; allergic reactions can happen (European Medicines Agency, 2012). Pregnancy/breastfeeding: not recommended due to lack of good safety data (European Medicines Agency, 2012). Kids: many preparations are not recommended under 12 (and some root extracts under 4) unless a labeled product specifically allows it (European Medicines Agency, 2012).

Safety note^{[11, 12, 13, 14]}Caution

Duke (2002) provides clinical evidence (score 2) for cowslip's expectorant and secretolytic activities, consistent with Commission E approval for bronchitis and cough with mucus. Dose: 0.5–1 g root or 1–2 g herb as tea three times daily. Saponins in the root are responsible for the expectorant action. Duke warns that the plant may cause hemolysis in large doses due to saponin content, and caution is warranted in individuals with aspirin sensitivity due to phenolic acid content (Duke, 2002).

Safety note^{[11, 13]}Caution

Generally well tolerated as flower/leaf preparations. It contains salicylates, so use caution if you are salicylate-sensitive; the root in large doses is emetic and purgative.

Safety note^[13]Caution

Safety in pregnancy and breastfeeding is not established, so avoid medicinal doses.

External Ids

Gbif: 8377689

Wikidata: Q157552

Gbif: 5331181

Wikidata: Q108684

Botanical Description

Low perennial herb (Primulaceae) forming a basal rosette of wrinkled, oval, softly hairy leaves that taper abruptly to a winged stalk. A single leafless flowering stem rises from the rosette bearing a one-sided umbel of small, fragrant, deep yellow, funnel-shaped flowers with orange spots at the throat, nodding on slender pedicels.^[10]

Height: Low rosette; flowering stem 10-25 cm

Habit: Low rosette-forming perennial herb

Leaves: Wrinkled, oval, softly hairy, tapering to a winged stalk

Flowers: Small, fragrant, deep yellow, funnel-shaped with orange throat spots, in a one-sided nodding umbel

Stem: Single, leafless flowering stem

Root: Short rhizome with fibrous roots

Fruit: Small capsule

Flowering Period: April-May

Low, spreading perennial herb with heart-shaped, softly toothed leaves arising from a short rootstock, spreading by runners (stolons). Fragrant, deep violet-purple (occasionally white) flowers with five petals, the lower petal spurred, are borne singly on slender stalks.^[11]

Height: 5-15 cm

Habit: Low, spreading perennial herb, spreading by runners

Leaves: Heart-shaped, softly toothed

Flowers: Fragrant, deep violet-purple (occasionally white), five-petalled, the lower petal spurred, borne singly

Stem: Very short; leaves and flowers arise from a basal rootstock, spreading by stolons

Root: Short rootstock with spreading runners

Fruit: Small three-valved capsule

Flowering Period: February-April (with a lighter second flush in autumn)

Habitat

Native across Europe and western Asia, growing in unimproved, species-rich grassland, meadows, pastures, open woodland and hedge banks on calcareous or well-drained soils.^[10]

Grows in woodland edges, hedgerows, shaded banks and gardens on moist, humus-rich soils; native to Europe, North Africa and Asia and widely naturalised and cultivated elsewhere.^[11]

Harvesting

Flowers are picked in spring as they open; the root/rhizome is dug in autumn.

Parts: Flower, Root/rhizome

Season: Flower in spring; root/rhizome in autumn

Flowers are picked as they open in early spring; leaves can be gathered through the growing season and dried.^[11]

Parts: Flower and leaf (aerial parts)

Season: Flower in early spring; leaf through the growing season

Traditional Uses

Cowslip has a long European folk tradition as an expectorant remedy for coughs and bronchial catarrh, and the flowers have traditionally been used as a mild sedative and for headache. Modern research on its saponin-rich root supports secretolytic (mucus-thinning) expectorant activity, and its flowers are rich in antioxidant phenolics.^{[1, 6]}

Sweet violet flower and leaf have a long European folk history as a soothing demulcent and expectorant remedy for cough, bronchitis and catarrh, and as a mild sedative for sleeplessness and headache; the flower syrup in particular has a long tradition as a children's cough remedy.^[11]

Preparations

Root decoction/tea^[1]

Dried root simmered or infused, the traditional expectorant preparation for cough with mucus.

Standardised combination extract^[1]

Root is a component of some standardised multi-herb bronchial/cough products (e.g. combined with ivy and thyme).

Syrup (flower)^[12]

Fresh flowers infused and combined with sugar syrup as a traditional soothing cough remedy, particularly for children.

Infusion^[11]

Dried flower or leaf infused in hot water as a traditional demulcent, calming tea.

Dosage

Root/herb tea^{[11, 12, 13]}

Duke (2002): about 0.5-1 g root or 1-2 g herb as tea, three times daily. Educational reference only, not a prescription; large doses of the saponin-rich root can cause gastrointestinal upset.

Infusion/syrup^[8]

A double-blind randomised placebo-controlled trial used 5 mL of Viola odorata syrup every 12 hours for 4 weeks as add-on therapy for insomnia. Traditional references suggest around 2-4 g of dried flower and leaf per cup, up to three times daily. Note the EU monograph on Violae herba cum flore covers Viola tricolor, a different species, and its posology does not transfer here. Educational reference only, not a prescription.

References

REF-0870, REF-0871, REF-0872, REF-0873, REF-0874, REF-0875, REF-0876, REF-0877, REF-0878, REF-0879

REF-1143, REF-1144, REF-1145, REF-1146, REF-1147, REF-1148, REF-1149, REF-1150, REF-1151, REF-1152

Drug Class Interactions

Safety note^{[15, 16]}Caution

Drug Class: sedatives-cns-depressants

Mechanism: Cowslip is traditionally used as a calming, sedative herb; taken with sedatives, sleeping tablets or other central-nervous-system depressants (including alcohol) it may add to drowsiness and slowed reactions.

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-03

Safety note^{[14, 15]}Caution

Drug Class: sedatives-cns-depressants

Mechanism: Sweet violet is traditionally used as a calming, sedative herb; taken with sedatives, sleeping tablets or other central-nervous-system depressants (including alcohol) it may add to drowsiness and slowed reactions.

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-03

Lookalikes Review

Outcome: none-known

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-07

Outcome: has-lookalikes

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-07

Dangerous Lookalikes

Not documented

Safety note^[16]Irritant

Dangerous Plant: ficaria-verna

Confused Part: Low, heart-shaped spring leaves gathered as an edible; lesser celandine forms similar low leaves at the same time and place.

Confusion Context: Sweet violet (Viola odorata) is foraged in early spring for its heart-shaped leaves and flowers. Lesser celandine (Ficaria verna, fig buttercup) grows in the same season and habitat and, as foraging guidance warns, its low-growing leaves closely resemble violet; lesser celandine is toxic to humans in most stages (it contains the acrid irritant protoanemonin). Because their spring leaves are alike, this is a genuine early-season foraging hazard, although cooking destroys the toxin and the acrid taste discourages eating much.

Distinguishing Features: Flowers (decisive): sweet violet has purple (sometimes white) flowers with five uneven petals. Lesser celandine has glossy, bright-yellow star-like flowers with 8-12 petals. A yellow many-petalled flower means lesser celandine, never violet., Leaves: violet leaves are matt and heart-shaped on their own stalks from the base. Lesser celandine leaves are glossier and more kidney- to arrow-shaped, sometimes with pale mottling., Best practice: harvest violet leaves only once you can trace every leaf to a violet plant (ideally in flower), not to a yellow-flowered plant.

Key Test: Wait until the plant flowers, or trace each leaf to its flower. Purple five-petalled flowers with matt heart-shaped leaves = sweet violet. Glossy yellow flowers with 8-12 petals = lesser celandine - do not eat it raw. If you cannot confirm a violet flower, do not gather the leaves.

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-07

References & Sources

Veldman, J., Bordewijk, E., Lloyd, A.R., Vlieger, A.M. and others (2023) 'Mechanistic Evidence of Andrographis paniculata, Pelargonium sidoides, Echinacea Species and a Combination of Hedera helix, Primula veris/elatior and Thymus vulgaris/zygis in the Treatment of Acute, Uncomplicated Respiratory Tract Infections: A Systematic Literature Review and Expert Interviews', Pharmaceuticals (Basel), 16(9), pp. 1206. doi:10.3390/ph16091206 Meta-analysis / review
https://doi.org/10.3390/ph16091206
Baczek, K.B., Kosakowska, O., Przybyl, J.L., Pioro-Jabrucka, E. and others (2017) 'Phenolics in Primula veris L. and Primula elatior (L.) Hill Raw Materials', International Journal of Analytical Chemistry, 2017, pp. 2871579. doi:10.1155/2017/2871579 Preclinical
https://doi.org/10.1155/2017/2871579
Prokofiev, A.B., Latypova, G.M., Bondarenko, T.A., Romanenko, E.B. and others (2023) 'Solid herbal extract of Primula veris L. improves morphofunctional condition of rats' myocardium in chronic alcohol intoxication', Journal of Traditional and Complementary Medicine, 13(3), pp. 306-314. doi:10.1016/j.jtcme.2023.02.006 Preclinical
https://doi.org/10.1016/j.jtcme.2023.02.006
Tarapatskyy, M., Gumienna, A., Sowa, P., Kapusta, I. and Puchalski, C (2021) 'Bioactive Phenolic Compounds from Primula veris L.: Influence of the Extraction Conditions and Purification', Molecules, 26(4), pp. 997. doi:10.3390/molecules26040997 Preclinical
https://doi.org/10.3390/molecules26040997
Trendafilova, A., Ivanova, V., Todorova, M., Aneva, I. and others (2025) 'Phytochemical Characterization and Anti-Biofilm Activity of Primula veris L. Roots', Molecules, 30(8), pp. 1702. doi:10.3390/molecules30081702 Preclinical
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Colombo, P.S., Flamini, G., Rodondi, G., Giuliani, C. and others (2017) 'Phytochemistry of European Primula species', Phytochemistry, 143, pp. 132-144. doi:10.1016/j.phytochem.2017.07.005 Traditional / reference
https://doi.org/10.1016/j.phytochem.2017.07.005
Latypova, G.M., Bondarenko, T.A., Katayev, V.A., Romanenko, E.B. and others (2019) 'Composition and cardioprotective effects of Primula veris L. solid herbal extract in experimental chronic heart failure', Phytomedicine, 54, pp. 17-26. doi:10.1016/j.phymed.2018.09.015 Preclinical
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Brys, R. and Jacquemyn, H (2015) 'Disruption of the distylous syndrome in Primula veris', Annals of Botany, 115(1), pp. 27-39. doi:10.1093/aob/mcu211 Preclinical
https://doi.org/10.1093/aob/mcu211
Muller, A., Ganzera, M. and Stuppner, H (2006) 'Analysis of phenolic glycosides and saponins in Primula elatior and Primula veris (primula root) by liquid chromatography, evaporative light scattering detection and mass spectrometry', Journal of Chromatography A, 1112(1-2), pp. 218-223. doi:10.1016/j.chroma.2005.10.067 Preclinical
https://doi.org/10.1016/j.chroma.2005.10.067
Graikou, K., Damianakos, H., Ganos, C., Syklowska-Baranek, K. and others (2023) 'Comparative Phytochemical Analyses of Flowers from Primula veris subsp. veris Growing Wild and from Ex Situ Cultivation in Greece', Foods, 12(13), pp. 2623. doi:10.3390/foods12132623 Preclinical
https://doi.org/10.3390/foods12132623
European Medicines Agency (2012) 'European Union herbal monograph on Primula veris L'. Traditional / reference
https://scholar.google.com/scholar?q=European%20Union%20herbal%20monograph%20on%20Primula%20veris%20L
Royal Botanic Gardens, Kew (n.d.). Available at: https://powo.science.kew.org Traditional / reference
https://powo.science.kew.org
Wicke, L (2007) 'Primula veris in the treatment of upper respiratory infections', pp. 109--116. Traditional / reference
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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
Ghasemzadeh Rahbardar, M. and Hosseinzadeh, H (2024) 'Therapeutic potential of hypnotic herbal medicines: A comprehensive review', Phytotherapy Research, 38(6), pp. 3037-3059. doi:10.1002/ptr.8201 Meta-analysis / review
https://doi.org/10.1002/ptr.8201
Block, K.I., Gyllenhaal, C. and Mead, M.N (2004) 'Safety and efficacy of herbal sedatives in cancer care', Integrative Cancer Therapies, 3(2), pp. 128-148. doi:10.1177/1534735404265003 Meta-analysis / review
https://doi.org/10.1177/1534735404265003

Feyzabadi, Z., Ghorbani, F., Vazani, Y. and Zarshenas, M.M (2017) 'A Critical Review on Phytochemistry, Pharmacology of Viola odorata L. and Related Multipotential Products in Traditional Persian Medicine', Phytotherapy Research, 31(11), pp. 1669-1675. doi:10.1002/ptr.5909 Meta-analysis / review
https://doi.org/10.1002/ptr.5909
Heger, T., Zatloukal, M., Kubala, M., Strnad, M. and others (2022) 'Procyanidin C1 from Viola odorata L. inhibits Na,K-ATPase', Scientific Reports, 12(1), pp. 7011. doi:10.1038/s41598-022-11086-y Preclinical
https://doi.org/10.1038/s41598-022-11086-y
Yousefnia, S., Naseri, D., Seyed Forootan, F., Tabatabaeian, M. and others (2020) 'Suppressive role of Viola odorata extract on malignant characters of mammosphere-derived breast cancer stem cells', Clinical & Translational Oncology, 22(9), pp. 1619-1634. doi:10.1007/s12094-020-02307-9 Preclinical
https://doi.org/10.1007/s12094-020-02307-9
Tafazoli, V., Shahriari, M., Heydari, M., Nikbakht, H.A. and others (2020) 'The Effect of Viola odorata L. Oil for Fever in Children: A Randomized Triple-blinded Placebo-controlled Clinical Trial', Current Drug Discovery Technologies, 17(5), pp. 696-703. doi:10.2174/1570163816666190620142256 Randomized trial
https://doi.org/10.2174/1570163816666190620142256
Rahimi, V.B., Askari, V.R., Emami, S.A. and Tayarani-Najaran, Z (2017) 'Anti-melanogenic activity of Viola odorata different extracts on B16F10 murine melanoma cells', Iranian Journal of Basic Medical Sciences, 20(3), pp. 242-249. doi:10.22038/ijbms.2017.8350 Preclinical
https://doi.org/10.22038/ijbms.2017.8350
Adel Mehraban, M.S., Shirzad, M., Mohammad Taghizadeh Kashani, L., Ahmadian-Attari, M.M. and others (2022) 'Efficacy and safety of add-on Viola odorata L. in the treatment of COVID-19: A randomized double-blind controlled trial', Journal of Ethnopharmacology, 304, pp. 116058. doi:10.1016/j.jep.2022.116058 Randomized trial
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Saleem, U., Hira, S., Anwar, F., Shah, M.A. and others (2021) 'Pharmacological Screening of Viola odorata L. for Memory-Enhancing Effect via Modulation of Oxidative Stress and Inflammatory Biomarkers', Frontiers in Pharmacology, 12, pp. 664832. doi:10.3389/fphar.2021.664832 Preclinical
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Shayesteh, M., Vaez-Mahdavi, M.R., Shams, J., Kamalinejad, M. and others (2020) 'Effects of Viola odorata as an Add-On Therapy on Insomnia in Patients with Obsession or Depression: A Pilot Randomized Double-Blind Placebo-Controlled Trial', Journal of Alternative and Complementary Medicine, 26(5), pp. 398-408. doi:10.1089/acm.2019.0254 Randomized trial
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Feyzabadi, Z., Jafari, F., Kamali, S.H., Ashayeri, H. and others (2014) 'Efficacy of Viola odorata in Treatment of Chronic Insomnia', Iranian Red Crescent Medical Journal, 16(12), pp. e17511. doi:10.5812/ircmj.17511 Clinical study
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Parsley, N.C., Kirkpatrick, C.L., Crittenden, C.M., Rad, J.G. and others (2018) 'PepSAVI-MS reveals anticancer and antifungal cycloviolacins in Viola odorata', Phytochemistry, 152, pp. 61-70. doi:10.1016/j.phytochem.2018.04.014 Preclinical
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Herbal Reality (n.d.) 'Violets (Viola odorata): Benefits, Safety, Uses'. Available at: https://www.herbalreality.com/herb/violets/ Traditional / reference
https://www.herbalreality.com/herb/violets/
Qasemzadeh, M.J., Sharifi, H., Hamedanian, M., Gharehbeglou, M., Heydari, M., Sardari, M., Akhlaghdoust, M. and Minae, M.B (2015) 'The Effect of Viola odorata Flower Syrup on the Cough of Children With Asthma: A Double-Blind, Randomized Controlled Trial', Journal of Evidence-Based Complementary & Alternative Medicine, 20(4), pp. 287--291. doi:10.1177/2156587215584862 Randomized trial
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RxList (n.d.) 'Sweet Violet: Health Benefits, Side Effects, Uses, Dose & Precautions'. Available at: https://www.rxlist.com/supplements/sweet_violet.htm Traditional / reference
https://www.rxlist.com/supplements/sweet_violet.htm
Ghasemzadeh Rahbardar, M. and Hosseinzadeh, H (2024) 'Therapeutic potential of hypnotic herbal medicines: A comprehensive review', Phytotherapy Research, 38(6), pp. 3037-3059. doi:10.1002/ptr.8201 Meta-analysis / review
https://doi.org/10.1002/ptr.8201
Block, K.I., Gyllenhaal, C. and Mead, M.N (2004) 'Safety and efficacy of herbal sedatives in cancer care', Integrative Cancer Therapies, 3(2), pp. 128-148. doi:10.1177/1534735404265003 Meta-analysis / review
https://doi.org/10.1177/1534735404265003
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Cowslip monograph Sweet Violet monograph Compare other plants

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.