Plant Comparison

Lavender vs Cowslip

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 ALavenderLavandula angustifoliaLamiaceaeFull monograph →

Plant BCowslipPrimula verisPrimulaceaeFull monograph →

At a glance

Lavender and Cowslip: they share 4 indicated uses (arthritis / joint pain, inflammation (general), insomnia / sleeplessness, …); 3 pharmacological actions in common.

LavenderCowslip

Constituents22

Pharmacological actions73

Indicated uses105

Safety notes22

Cited sources2516

Indicated uses

Only Lavender

Cancer (anticancer research)EczemaInfection (general)Menstrual crampsMuscle spasmWounds

Shared (4)

Arthritis / joint painInflammation (general)Insomnia / sleeplessnessSkin irritation

Only Cowslip

Respiratory support

Pharmacological actions

Only Lavender

Anticancer (preclinical)AntimicrobialAntispasmodicEmollient / skin-soothing

Shared (3)

Anti-inflammatoryAntioxidantSedative / sleep support

Only Cowslip

none

Evidence face-off — shared uses

Condition	Lavender	Cowslip	Verdict
Arthritis / joint pain	5/10	1/10	Stronger for Lavender
Inflammation (general)	5/10	1/10	Stronger for Lavender
Insomnia / sleeplessness	5/10	1/10	Stronger for Lavender
Skin irritation	5/10	1/10	Stronger for Lavender

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

Essential oil (linalool, linalyl acetate)^[4]

Flower essential oil dominated by linalool and linalyl acetate, the principal compounds behind the calming, anxiolytic and antimicrobial activity.

Essential (volatile) oilLinalool

Flavonoids and phenolic acids

Antioxidant constituents of the flower.

FlavonoidsPhenolic acids

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

Pharmacological Actions

Anti-inflammatory^{[4, 12, 16, 17, 18]}

Anticancer (preclinical)^[13]

Antimicrobial^{[6, 16, 17, 18]}

Antioxidant^{[10, 16, 17, 18]}

Antispasmodic^{[16, 17, 18]}

Antispasmodic (cramp easing)

Emollient / skin-soothing^{[16, 17, 18]}

Sedative / sleep support^{[5, 7, 8, 9, 11, 14, 16, 17, 18]}

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

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

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

Traditional & Indicated Uses

Arthritis / joint pain^{[16, 17, 18]}Moderate · 5/10

inferred from anti-inflammatory action

Evidence: 5

Label: Arthritis / joint pain

Cancer (anticancer research)^[13]Traditional · 2/10

inferred from anticancer action

Evidence: 2

Label: Cancer (anticancer research)

Eczema^{[16, 17, 18]}Moderate · 5/10

inferred from emollient action

Evidence: 5

Label: Eczema

Infection (general)^{[16, 17, 18]}Moderate · 5/10

inferred from antimicrobial action

Evidence: 5

Label: Infection (general)

Inflammation (general)^{[16, 17, 18]}Moderate · 5/10

inferred from anti-inflammatory action

Evidence: 5

Label: Inflammation (general)

Insomnia / sleeplessness^{[16, 17, 18]}Moderate · 5/10

inferred from sedative action

Evidence: 5

Label: Insomnia / sleeplessness

Menstrual cramps^{[16, 17, 18]}Moderate · 5/10

inferred from antispasmodic action

Evidence: 5

Label: Menstrual cramps

Muscle spasm^{[16, 17, 18]}Moderate · 5/10

inferred from antispasmodic action

Evidence: 5

Label: Muscle spasm

Skin irritation^{[16, 17, 18]}Moderate · 5/10

inferred from anti-inflammatory action

Evidence: 5

Label: Skin irritation

Wounds^{[16, 17, 18]}Moderate · 5/10

inferred from antimicrobial action

Evidence: 5

Label: Wounds

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

Safety, Cautions & Contraindications

Safety note^{[16, 17, 18]}Caution

Generally very safe. Essential oil should not be ingested in large amounts. Rarely, contact dermatitis may occur. May potentiate the effect of sedative medications. Avoid therapeutic doses during pregnancy.

Safety note^{[16, 17, 18, 19]}Info

Duke (2002) rates lavender as ++ and provides clinical evidence (score 2) for carminative activity, consistent with Commission E approval for nervous stomach disorders and functional abdominal complaints. Additional experimental activities include anxiolytic, antispasmodic, and antiseptic effects. The essential oil demonstrates COX-2 inhibitory and Alzheimer's-relevant properties at the experimental level. Dose: 1–2 teaspoons (4–8 g) dried flowers as tea; 1–3 drops essential oil in a carrier for topical or aromatherapy use. Duke notes that oral lavender oil (Silexan) has clinical evidence for generalized anxiety disorder (Duke, 2002).

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).

External Ids

Gbif: 2927305

Wikidata: Q42081

Gbif: 8377689

Wikidata: Q157552

Botanical Description

Aromatic, evergreen, woody-based perennial subshrub with narrow, grey-green, felted leaves. Slender flowering spikes carrying whorls of small, tubular, two-lipped violet-blue flowers rise well above the foliage on long, unbranched stalks.^[4]

Height: 30-60 cm

Habit: Aromatic, evergreen, woody-based perennial subshrub

Leaves: Narrow, grey-green, felted

Flowers: Small, tubular, two-lipped, violet-blue, in whorled spikes on long stalks

Stem: Woody at the base, with slender unbranched flowering stalks

Root: Woody rootstock

Fruit: Small nutlet (typical of Lamiaceae)

Flowering Period: June-August

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

Habitat

Native to the mountains of the western Mediterranean (southern France, Spain, Italy); widely cultivated in sunny, well-drained, often calcareous sites across temperate and Mediterranean climates worldwide.^[4]

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]

Harvesting

The flower spikes are cut as the flowers open, in mid- to late summer, when essential oil content is highest, and dried in a warm, shaded, airy place or distilled fresh for essential oil.^[4]

Parts: Flower

Season: Mid- to late summer, at flowering

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

Traditional Uses

Lavender flower has a long Mediterranean and European tradition as a calming, sedative herb for nervous tension, anxiety and insomnia, and as a mild digestive carminative and antiseptic for minor wounds and skin irritation; the essential oil in particular has an extensive modern clinical evidence base for anxiety and sleep support.^[4]

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]}

Preparations

Infusion^[4]

Dried flowers infused in hot water as a traditional calming, digestive tea.

Essential oil (aromatherapy/topical)^[4]

Steam-distilled from the flowers; used diluted topically or by inhalation for relaxation and skin care.

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).

Dosage

Infusion^[15]

The EU herbal monograph gives 1-2 g of the flower in 150 mL of boiling water as an infusion, three times daily, in adolescents, adults and elderly; a tincture at 2-4 mL three times daily is also listed. The monograph notes that lavender may impair the ability to drive or use machines. Not recommended under 12 years. Educational reference only, not a prescription.

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.

References

REF-0857, REF-0858, REF-0859, REF-2205, REF-2206, REF-2207, REF-2208, REF-2209, REF-2210, REF-2211, REF-2212, REF-2213, REF-2214, REF-2215

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

Drug Class Interactions

Safety note^{[20, 21, 22]}Caution

Drug Class: sedatives-cns-depressants

Mechanism: Lavender has calming, sedative effects (its anxiolytic effect is supported by a meta-analysis of randomised trials of the oral oil preparation Silexan); taken with sedatives, sleeping tablets or other central-nervous-system depressants (including alcohol) it may add to drowsiness and slowed reactions.