Plant Comparison

Chili Pepper vs Field restharrow

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 AChili PepperCapsicum annuumSolanaceaeFull monograph →
Plant BField restharrowOnonis arvensisFabaceaeFull monograph →

At a glance

Chili Pepper and Field restharrow: they share 6 indicated uses (cardiovascular / heart health, infection (general), inflammation (general), …); 3 pharmacological actions in common.

Chili PepperField restharrow
Constituents36
Pharmacological actions412
Indicated uses1111
Safety notes23
Cited sources1942
Indicated uses
Only Chili Pepper
Arthritis / joint painBack painBloatingHeadacheIndigestion
Shared (6)
Cardiovascular / heart healthInfection (general)Inflammation (general)Pain (general)Skin irritationWounds
Only Field restharrow
Cancer (anticancer research)Urinary supportUrinary tract infection (UTI)Kidney supportSwelling / fluid retention
Pharmacological actions
Only Chili Pepper
Digestive aid
Shared (3)
Analgesic (pain relief)Anti-inflammatoryAntimicrobial
Only Field restharrow
DiureticUrinary antisepticVulnerary (wound healing)AntioxidantGastroprotectiveAnticancer (preclinical)AntifungalLipid-loweringAntiplatelet / anticoagulant

Evidence face-off — shared uses

ConditionChili PepperField restharrowVerdict
Cardiovascular / heart health3/102/10Comparable evidence
Infection (general)1/102/10Comparable evidence
Inflammation (general)1/102/10Comparable evidence
Pain (general)6/102/10Stronger for Chili Pepper
Skin irritation1/102/10Comparable evidence
Wounds1/102/10Comparable 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

Capsaicinoids (capsaicin, dihydrocapsaicin)[8]

The pungent alkaloid-like compounds responsible for the fruit's heat and its counterirritant/analgesic action via TRPV1 receptor desensitisation.

Carotenoids (capsanthin, beta-carotene)[8]

Give ripe red fruit its colour and contribute antioxidant and anti-inflammatory activity.

Carotenoids
Flavonoids (luteolin, apigenin)[1]

Antioxidant and anti-inflammatory flavonoids identified in leaf and fruit extracts.

FlavonoidsLuteolinApigenin
Isoflavonoids (formononetin, ononin and derivatives)[1, 3, 5, 20]

Formononetin and its 7-O-glucoside ononin, plus related isoflavones - the signature restharrow constituents (also phytoestrogens).

FlavonoidsGlycosidesPhenolic compounds
Pterocarpans and isoflavanones (medicarpin, maackiain, onogenin, sativanone)[1, 4]

Pterocarpans and isoflavanones and their glucosides, contributing to antimicrobial and wound-healing activity.

FlavonoidsGlycosides
alpha-Onocerin[7]

alpha-Onocerin (onocerin), a characteristic triterpene of the genus Ononis.

Triterpene saponinsTerpenes / terpenoids
Coumarins (scopoletin, scopolin)[1]

Coumarins detected in the phytochemical profile.

Coumarins
Hydroxycinnamic / phenolic acids[6]

Caffeic, chlorogenic and p-coumaric acids (antioxidant).

Caffeic acidChlorogenic acidPhenolic acids
Essential (volatile) oil[10]

A volatile oil present in the root and aerial parts.

Essential (volatile) oil

Pharmacological Actions

Analgesic (pain relief)[3, 6, 8, 13, 14, 15, 16]
Anti-inflammatory[1, 2, 5, 8, 13, 14, 15, 16]
Antimicrobial[7, 14, 16, 17]
Digestive aid[3, 4, 9, 14, 16]
Diuretic[8, 13, 28, 30, 42]

Aquaretic diuretic; the classic irrigation-therapy action of restharrow root (Ononidis radix), used interchangeably for O. arvensis and O. spinosa.

Urinary antiseptic[15]

Aqueous root extract reduced adhesion of uropathogenic E. coli to bladder cells (anti-adhesive).

Anti-inflammatory[14, 16, 17, 39]

Inhibits IL-8 release via TLR4/LPS and cytosolic phospholipase A2alpha (restharrow root).

Antimicrobial[2, 13, 21, 41]
Vulnerary (wound healing)[16, 20]

Isoflavonoids from restharrow root promote wound healing in vivo.

Antioxidant[5, 6, 13, 21, 31, 34, 40]
Analgesic (pain relief)[18, 33]

Analgesic activity of Ononis extract in animals (congener O. spinosa).

Gastroprotective[19]

Protective against ethanol-induced gastric mucosal injury (congener O. spinosa).

Anticancer (preclinical)[5, 27]

Ononis isoflavones showed chemopreventive/antiproliferative activity against breast cancer cells (preclinical).

Antifungal[22]
Lipid-lowering[24, 35]
Antiplatelet / anticoagulant[26]

Traditional & Indicated Uses

Arthritis / joint pain[13, 14, 15, 16, 17]Moderate · 6/10

inferred from anti-inflammatory action

Evidence: 6
Label: Arthritis / joint pain
Back pain[13, 14, 15, 16, 17]Moderate · 6/10

inferred from analgesic action

Evidence: 6
Label: Back pain
Bloating[14, 16, 17]Traditional · 1/10

inferred from digestive action

Evidence: 1
Label: Bloating
Cardiovascular / heart health[14, 16, 17, 18]Limited · 3/10
Evidence: 3
Label: Cardiovascular / heart health
Headache[14, 16, 17]Traditional · 1/10

inferred from analgesic action

Evidence: 1
Label: Headache
Indigestion[14, 16, 17]Traditional · 1/10

inferred from digestive action

Evidence: 1
Label: Indigestion
Infection (general)[14, 16, 17]Traditional · 1/10

inferred from antimicrobial action

Evidence: 1
Label: Infection (general)
Inflammation (general)[14, 16, 17]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1
Label: Inflammation (general)
Pain (general)[13, 14, 15, 16, 17]Moderate · 6/10
Evidence: 6
Label: Pain (general)
Skin irritation[14, 16, 17]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1
Label: Skin irritation
Wounds[14, 16, 17]Traditional · 1/10

inferred from antimicrobial action

Evidence: 1
Label: Wounds
Cancer (anticancer research)[5, 27]Traditional · 2/10

inferred from anticancer action

Evidence: 2
Label: Cancer (anticancer research)
Urinary support[8, 13, 15, 28, 30]Strong · 9/10

Aquaretic diuretic for irrigation therapy of the urinary tract.

Evidence: 9
Label: Urinary support
Urinary tract infection (UTI)[15]Traditional · 2/10

Anti-adhesive activity against uropathogenic E. coli.

Evidence: 2
Label: Urinary tract infection (UTI)
Kidney support[8, 13]Good · 7/10

inferred from diuretic / urinary 'gravel' traditional use

Evidence: 7
Label: Kidney support
Swelling / fluid retention[13]Good · 7/10

inferred from diuretic (aquaretic) action

Evidence: 7
Label: Swelling / fluid retention
Infection (general)[2]Traditional · 2/10

inferred from antimicrobial action

Evidence: 2
Label: Infection (general)
Wounds[16]Traditional · 2/10

Isoflavonoid wound-healing agents from restharrow root.

Evidence: 2
Label: Wounds
Skin irritation[8, 17]Traditional · 2/10

inferred from anti-inflammatory and traditional skin/eczema use

Evidence: 2
Label: Skin irritation
Inflammation (general)[14, 17]Traditional · 2/10
Evidence: 2
Label: Inflammation (general)
Pain (general)[18]Traditional · 2/10

inferred from analgesic action

Evidence: 2
Label: Pain (general)
Cardiovascular / heart health[24, 26, 35]Traditional · 2/10

Ononis isoflavonoids (maackiain, ononin) showed anti-adipogenic activity via PPAR-gamma inhibition (preclinical).

Evidence: 2
Label: Cardiovascular / heart health

Safety, Cautions & Contraindications

Safety note[13, 14, 15, 16, 17, 18]Caution

Capsaicin causes intense burning sensation; avoid contact with eyes and mucous membranes. High oral doses can cause gastrointestinal irritation, nausea, and diarrhoea. Topical preparations may cause skin irritation and should be used diluted. Not recommended for individuals with active peptic ulcers. Caution with anticoagulants — capsaicin may enhance bleeding risk. During pregnancy, culinary amounts are considered safe, but high-dose supplements should be avoided. Repeated topical application leads to desensitisation (TRPV1 depletion), which is the basis for its analgesic use. Children under 2 should not be given capsaicin-containing topical products (Basu and Bhattacharyya, 2023).

Safety note[13, 14, 15, 16, 17, 18, 19]Caution

Duke (2002) rates cayenne/chili pepper (Capsicum annuum) highly for its clinically documented analgesic, counterirritant, and rubefacient activities. Commission E approves topical capsaicin preparations for muscle pain, arthritis, and neuralgia (score 2). The active compound capsaicin depletes substance P in sensory neurons upon repeated application, reducing pain signals. Capsaicin cream (0.025–0.075%) is a validated treatment for post-herpetic neuralgia, diabetic neuropathy, and osteoarthritis pain. Internal use can irritate mucous membranes; external use requires avoiding contact with eyes and mucous membranes (Duke, 2002).

Safety note[18]Warning

A safety signal exists in the genus: an Ononis spinosa root extract showed hepatotoxic effects at higher doses in animals (alongside analgesic activity). Avoid excessive or prolonged use, and use caution in liver disease.

Safety note[13]Caution

Used as an aquaretic for irrigation therapy of the urinary tract, restharrow should be taken with a generous fluid intake; it should NOT be used for 'flushing' when there is oedema due to impaired heart or kidney function (standard irrigation-therapy caution).

Safety note[1, 3]Caution

The root is rich in isoflavone phytoestrogens (formononetin); avoid medicinal doses in pregnancy and breastfeeding and use caution in hormone-sensitive conditions.

External Ids

Gbif: 2932944
Wikidata: Q1380
Gbif: 2977171
Wikidata: Q164263

Botanical Description

Bushy annual or short-lived perennial herb (grown as an annual in temperate climates) with glossy, oval to lance-shaped leaves. Small, star-shaped, white to greenish flowers give way to the characteristic fleshy, hollow fruit (a berry), which ripens from green through yellow to red and varies enormously in size, shape and pungency between cultivars.[1]

Height: 0.5-1.5 m
Habit: Bushy annual or short-lived perennial herb
Leaves: Glossy, oval to lance-shaped
Flowers: Small, star-shaped, white to greenish, borne singly or in small clusters
Stem: Branching, semi-woody at the base in older plants
Root: Fibrous root system
Fruit: Fleshy, hollow berry, ripening green to yellow/orange/red, containing numerous flat seeds
Flowering Period: Summer, continuing until frost

A tough, deep-rooted perennial herb or low subshrub of the pea family, 30-80 cm tall, sometimes bearing soft spines. It has a very long, woody, tenacious taproot - so strong it was said to stop (arrest) the harrow, giving 'rest-harrow' its name. The stems are hairy and sticky, often reddish, and clothed in small trifoliolate (clover-like) leaves with toothed leaflets. The flowers are typical pea flowers, pink to purplish-pink (occasionally white), borne singly or in pairs in the leaf axils. Field restharrow (O. arvensis) is generally less spiny than its close relative spiny restharrow (O. spinosa).[8, 10]

Height: 30-80 cm
Habit: Deep-rooted perennial herb or low subshrub, sometimes softly spiny
Leaves: Trifoliolate (clover-like), with finely toothed leaflets; stems hairy and glandular-sticky
Flowers: Pea-type, pink to purplish-pink (rarely white), solitary or paired in the leaf axils
Stem: Erect to ascending, hairy and sticky, often reddish; less spiny than O. spinosa
Root: Very long, woody, tenacious taproot (the medicinal Ononidis radix)
Fruit: A small, hairy, few-seeded pea pod
Flowering Period: June-September

Habitat

Native to Central and South America; cultivated worldwide in warm and temperate climates as a food and medicinal crop, thriving in full sun on well-drained soil.[1]

Rough grassland, field margins, roadsides, dunes and dry, sandy or calcareous waste ground across Europe, western Asia and parts of North Africa. As a deep-rooted, nitrogen-fixing legume it colonises poor, disturbed soils and was historically a troublesome weed of arable fields (hence 'restharrow').[8]

Harvesting

Fruit is picked at the desired stage of ripeness (green for milder use, fully red for maximum capsaicin and carotenoid content) through summer and autumn; seeds are separated and dried from fully ripe fruit.

Parts: Fruit, Seed
Season: Summer to autumn, at desired ripeness

The root (Ononidis radix) is the principal medicinal part, dug in autumn from the second year onward and dried; the aerial flowering parts are also gathered in summer. The long woody taproot is cleaned and cut before drying for decoctions and infusions.[8]

Parts: Root, Aerial parts
Season: Root in autumn; aerial parts in flower (summer)

Traditional Uses

Chili pepper fruit has a long history across the Americas and, after global spread, in many other traditional medicine systems as a warming digestive stimulant and topical counterirritant/analgesic for muscle and joint pain, building on capsaicin's now well-documented ability to desensitise pain-sensing nerve fibres with repeated application.[1]

Restharrow root has a long place in European herbal medicine as a gentle aquaretic diuretic used for 'irrigation therapy' of the urinary tract - to increase urine flow in cystitis, urinary gravel and stones, and to flush the bladder. Field restharrow (Ononis arvensis) is used interchangeably with the officinal spiny restharrow (O. spinosa, Ononidis radix). The root and flowering herb have also been used as a mild anti-inflammatory, for skin complaints and eczema, for rheumatic conditions, and (as a decoction or gargle) for the mouth and throat. The isoflavone-rich root is a folk remedy in central and eastern European traditions.[8, 13]

Preparations

Topical cream/ointment (capsaicin)[8]

Standardised capsaicin cream or patch applied to the affected area for muscle, joint or nerve pain; repeated application depletes substance P and reduces pain signalling.

Decoction[8, 13]

The dried root simmered in water and taken as an aquaretic diuretic for irrigation of the urinary tract; the classic restharrow preparation.

Infusion[8]

The flowering aerial parts infused as a milder diuretic and anti-inflammatory tea.

Gargle / wash[8]

A root decoction used traditionally as a mouth/throat gargle and as a wash for skin complaints.

Dosage

Topical capsaicin cream[12]

The EU herbal monograph on Capsici fructus gives semi-solid dosage forms corresponding to 40-53 mg capsaicinoids per 100 g, applied as a thin layer to the affected area 2-4 times daily, in adults and elderly. For medicated plasters, a maximum of 1 plaster per day applied for at least 4 and up to 12 hours, with at least 12 hours before a new plaster is applied to the same area. Not recommended under 18 years. Expect an initial burning sensation that lessens with repeated use. Note the monograph covers hot chilli fruit (C. annuum var. minimum and small-fruited C. frutescens), not sweet peppers. Educational reference only, not a prescription.

Not documented

References

REF-2142, REF-2143, REF-2144, REF-2145, REF-2146, REF-2147, REF-2148, REF-2149, REF-2150, REF-2151, REF-2152
REF-2741, REF-2742, REF-2743, REF-2744, REF-2745, REF-2746, REF-2747, REF-2748, REF-2749, REF-2750, REF-2751, REF-2752, REF-2753, REF-2754, REF-2755, REF-2756, REF-2757, REF-2758, REF-2759, REF-2760, REF-3015, REF-3016, REF-3017, REF-3018, REF-3019, REF-3020, REF-3021, REF-3022, REF-3023, REF-3024, REF-3025, REF-3026, REF-3027, REF-3028, REF-3029, REF-3030, REF-3031, REF-3032, REF-3033, REF-3034, REF-3035, REF-3036

Lookalikes Review

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

[8]

Outcome: none-known
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-10

Synonyms

Not documented

Ononis hircina, Ononis arvensis subsp. arvensis

Drug Class Interactions

Not documented

Safety note[8, 13]Caution
Drug Class: diuretics
Mechanism: Restharrow is an aquaretic diuretic; taken with pharmaceutical diuretics it may add to fluid and electrolyte loss.
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-10
Safety note[1, 3]Caution
Drug Class: hormonal-therapies
Mechanism: The root is rich in the isoflavone phytoestrogen formononetin; it could theoretically interact with hormonal contraceptives, hormone replacement or hormone-sensitive conditions.
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-10

Pairings

Not documented

Classic urinary irrigation-therapy pairing: both are aquaretic diuretics used to increase urine flow in cystitis and urinary gravel.[13]

Partner Id: solidago-virgaurea
Type: synergy
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-10

Both are traditional diuretic 'flushing' herbs for irrigation therapy of the urinary tract.[13]

Partner Id: betula-pendula
Type: synergy
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-10

Both are Fabaceae rich in the isoflavone phytoestrogen formononetin; combined use adds to phytoestrogen exposure - use caution in hormone-sensitive conditions.[1]

Partner Id: trifolium-pratense
Type: caution
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-10

References & Sources

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  11. Song, C., Yu, C., Zhu, X., Luo, X., Zhang, Y., Meng, L., Luo, Y., Chang, H., Qin, C. and Liu, Y (2020) 'A new capsaicin-containing phenolic glycoside from Capsicum annuum L', Natural Product Research, 36(2), pp. 546-552. doi:10.1080/14786419.2020.1789983 Preclinical
    https://doi.org/10.1080/14786419.2020.1789983
  12. European Medicines Agency (HMPC) (2015) 'European Union herbal monograph on Capsicum annuum L. var. minimum (Miller) Heiser and small fruited varieties of Capsicum frutescens L., fructus'. Available at: https://www.ema.europa.eu/en/documents/herbal-monograph/final-european-union-herbal-monograph-capsicum-annuum-l-var-minimum-miller-heiser-and-small-fruited-varieties-capsicum-frutescens-l-fructus_en.pdf Traditional / reference
    https://www.ema.europa.eu/en/documents/herbal-monograph/final-european-union-herbal-monograph-capsicum-annuum-l-var-minimum-miller-heiser-and-small-fruited-varieties-capsicum-frutescens-l-fructus_en.pdf
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    https://doi.org/10.1093/bja/aer260
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    https://doi.org/10.1007/s11101-023-09875-8
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  1. Gampe, N. and Darcsi, A. and Nagyne Nedves, A. and Boldizsar, I. and Kursinszki, L. and Beni, S (2019) 'Phytochemical analysis of Ononis arvensis L. by liquid chromatography coupled with mass spectrometry', Journal of Mass Spectrometry, 54(2), pp. 121-133. doi:10.1002/jms.4308 Preclinical
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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.