Plant Profile

Yellow loosestrife

Lysimachia vulgaris
Family: Primulaceae  ·  Parts used: Aerial parts, Flower, Leaf, Root  ·  Also known as: garden loosestrife, yellow willowherb (loosestrife)

The complete database record: 6 documented constituents, 8 pharmacological actions, 9 traditional / indicated uses, with 16 cited sources.

Botanical Description

A tall, erect perennial herb of the primrose family, 60-150 cm high, spreading by creeping rhizomes to form patches. The stems are softly downy and bear lance-shaped leaves in whorls of three or four (or opposite pairs), often gland-dotted. Bright yellow, five-petalled star-shaped flowers, about 15 mm across and often with reddish margins to the sepals, are carried in leafy branching clusters (panicles) at the top of the stem in summer. Despite the shared name 'loosestrife', it is unrelated to purple loosestrife (Lythrum salicaria).[4]

Height: 60-150 cm
Habit: Tall erect rhizomatous perennial, spreading in patches
Leaves: Lance-shaped, in whorls of 3-4 or opposite, often gland-dotted, softly hairy beneath
Flowers: Bright yellow, 5-petalled, star-shaped (about 15 mm), in leafy terminal panicles; sepals often red-margined
Stem: Erect, softly downy, little-branched below the flower cluster
Root: Creeping rhizome with fibrous roots
Fruit: A small globular capsule
Flowering Period: June-August

Habitat & Distribution

Wet ground: margins of rivers, lakes, ponds and ditches, fens, marshes, wet meadows and damp woodland, across Europe and temperate Asia (and naturalised in North America). It favours moist to waterlogged, fertile soils in sun or light shade and can form dense stands.[4]

Harvesting

The flowering aerial parts (leaves, stems, flowers) are gathered in summer while in flower and dried; the root/rhizome is also used. The plant is best cut from established patches in wet ground.[4]

Parts: Aerial parts, Flower, Root
Season: Aerial parts in flower (June-August); root in autumn

Key Constituents

Flavonoids (rutin, quercetin, kaempferol, myricitrin glycosides)[6, 7, 8, 9]

Flavonol glycosides - notably rutin - are the principal antioxidant constituents of yellow loosestrife.

FlavonoidsRutinQuercetinKaempferol
Phenolic acids[4, 9]

Caffeic-acid derivatives and chlorogenic acid (antioxidant).

Phenolic acidsCaffeic acidChlorogenic acid
Triterpenoid saponins[12, 15]

Oleanane-type triterpenoid saponins characteristic of the genus Lysimachia.

Triterpene saponinsSaponins
Isocoumarins and benzoquinones[1]

Root isocoumarins and benzoquinones with PCSK9-inhibitory (lipid-lowering) activity.

Phenolic compounds
Tannins[4]

Astringent tannins underlying the traditional styptic/antidiarrhoeal use.

Tannins
Lignans and loliolide[5]

The lignan pinoresinol and loliolide, which reduce hepatic lipogenesis.

Lignans

Pharmacological Actions

Antioxidant[4, 7, 9, 13]
Anti-inflammatory[3, 14]
Antimicrobial[4]

Antibacterial activity of the phenolic-rich extract.

Anticancer (preclinical)[4, 11, 15]

Antitumor activity of L. vulgaris extract; genus congeners (L. christinae, L. capillipes saponins) show anticancer activity.

Hepatoprotective (liver support)[2]

Ameliorates liver fibrosis and NASH in mice (L. vulgaris var. davurica).

Lipid-lowering[1, 5]

Root isocoumarins/benzoquinones inhibit PCSK9 expression and loliolide/pinoresinol reduce hepatic lipogenesis via liver-X-receptor degradation.

Antidiarrhoeal[3, 4]

Improves diarrhoea-predominant IBS (L. vulgaris var. davurica); traditional astringent antidiarrhoeal.

Astringent[4, 6]

Flavonoid- and tannin-rich herb; the basis of the traditional styptic and antidiarrhoeal use.

Traditional & Indicated Uses

Cancer (anticancer research)[4, 11, 15]Good · 7/10

inferred from anticancer action

Evidence: 7
Label: Cancer (anticancer research)

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Liver support[2]Preliminary · 2/10

Ameliorates liver fibrosis/NASH in animal models.

Evidence: 2
Label: Liver support

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High cholesterol[1, 5]Preliminary · 2/10

PCSK9 inhibition and reduced hepatic lipogenesis (lipid-lowering).

Evidence: 2
Label: High cholesterol

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Metabolic support[2, 5]Preliminary · 2/10

Improves NASH/metabolic and lipid parameters in animal models.

Evidence: 2
Label: Metabolic support

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Diarrhoea[3, 4]Preliminary · 2/10

Improves diarrhoea-predominant IBS; traditional astringent antidiarrhoeal.

Evidence: 2
Label: Diarrhoea

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Irritable bowel syndrome (IBS)[3]Preliminary · 2/10

Improved diarrhoea-predominant irritable bowel syndrome (var. davurica).

Evidence: 2
Label: Irritable bowel syndrome (IBS)

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Inflammation (general)[3, 14]Preliminary · 2/10
Evidence: 2
Label: Inflammation (general)

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Infection (general)[4]Preliminary · 2/10

inferred from antibacterial action

Evidence: 2
Label: Infection (general)

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Wounds[6]Preliminary · 2/10

inferred from astringent/styptic traditional use

Evidence: 2
Label: Wounds

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Traditional Use & History

Yellow loosestrife has a European folk-medicine reputation as an astringent and styptic: the flavonoid- and tannin-rich herb was used to stop bleeding (nosebleeds, wounds), for diarrhoea and dysentery, as a gargle and wash for mouth ulcers and sore throat, and to soothe inflammation. The dried herb was also burned to repel insects. More broadly, the genus Lysimachia is important in East Asian medicine - the closely related L. vulgaris var. davurica is used for liver and digestive complaints, while other congeners such as L. christinae (jin qian cao) are classic remedies for urinary and gallstones - reflecting a shared saponin and flavonoid chemistry.[2, 4, 10]

Preparations

Infusion[4]

The dried flowering herb infused as an astringent tea for diarrhoea and as a gargle/wash for mouth and throat inflammation.

Poultice / wash[6]

The fresh or dried herb applied as a styptic poultice or wash to stop bleeding and soothe wounds (traditional).

Safety, Cautions & Contraindications

Safety noteCaution

Safety data are limited and there are no human clinical trials; avoid medicinal doses in pregnancy and breastfeeding.

Safety note[4, 6]Info

Contains astringent tannins and flavonoids; large or prolonged doses may cause digestive upset and can reduce absorption of iron and some medicines.

Safety note[2]Info

Much of the pharmacological data are for Lysimachia vulgaris var. davurica and closely related Lysimachia species (e.g. L. christinae, L. foenum-graecum); apply to the plain species with appropriate caution.

Herb-Drug Interactions

Statins[1, 5]Caution
Mechanism: Yellow loosestrife root constituents inhibit PCSK9 expression and reduce hepatic lipogenesis; taken with statins or other lipid-lowering drugs they could theoretically add to cholesterol-lowering effects.
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-10

Herb-Herb Pairings

Cowslip[12]

Both are Primulaceae rich in triterpenoid saponins and flavonoids; related family chemistry rather than a specific therapeutic combination.

Type: neutral
Reviewed By: Omnia Sana (owner-authorized)
Reviewed Date: 2026-07-10

Botanical Synonyms

Lysimachia vulgaris var. davurica

Harvest Readiness

[16]

Part: aerial-parts
Signals: Gather the flowering aerial parts (herb) in summer, while in flower.
Basis: traditional
Source Quote: It is harvested when in flower in July and dried for later use.
Species Confirmed: 1
Notes: PFAF (REF-3290); the flowering herb is gathered while in flower (in flower April-September). Single lineage -> provisional.

[16]

Part: flower
Signals: Gather the yellow flowers in summer, while in flower.
Basis: traditional
Source Quote: It is harvested when in flower in July and dried for later use.
Species Confirmed: 1
Notes: PFAF (REF-3290); the flowers are gathered with the flowering herb in summer. Single lineage -> provisional.

[16]

Part: leaf
Signals: Gather the leaves with the flowering herb in summer.
Basis: traditional
Source Quote: It is harvested when in flower in July and dried for later use.
Species Confirmed: 1
Notes: PFAF (REF-3290); the leaf is gathered with the flowering herb in summer. Single lineage -> provisional.
Part: root
Notes: GAP (documented dead end, re-searched 2026-08-15). PFAF gives a harvest stage for the flowering HERB of Lysimachia vulgaris ('It is harvested when in flower in July and dried for later use') but says nothing about the root; the Madaus entry filed under this genus covers Lysimachia nummularia, a different species, and specifies 'the fresh, flowering plant WITHOUT root'. No root stage is asserted. Next seam: a central or eastern-European flora treating L. vulgaris root specifically.

External Identifiers

References & Sources

  1. Pel, P. and Kim, Y. and Kim, H.J. and Nhoek, P. and An, C. and Son, M. and Won, H. and Lee, S.E. and Lee, J. and Kim, H.W. and Choi, Y.H. and Lee, C.H. and Chin, Y (2022) 'Isocoumarins and Benzoquinones with Their Proprotein Convertase Subtilisin/Kexin Type 9 (PCSK9) Expression Inhibitory Activities from Dried Roots of Lysimachia vulgaris', ACS Omega, 7(50), pp. 47296-47305. doi:10.1021/acsomega.2c06660 Preclinical
    https://doi.org/10.1021/acsomega.2c06660
  2. Son, Y. and Jung, D.S. and Shin, J.M. and Kim, M. and Yoo, G. and Nho, C.W (2021) 'Yellow loosestrife (Lysimachia vulgaris var. davurica) ameliorates liver fibrosis in db/db mice with methionine- and choline-deficient diet-induced nonalcoholic steatohepatitis', BMC Complementary Medicine and Therapies, 21(1), pp. 44. doi:10.1186/s12906-021-03212-6 Preclinical
    https://doi.org/10.1186/s12906-021-03212-6
  3. Kim, H. and Kim, C. and Oh, D. and Kim, Y. and Choi, C. and Kim, J (2024) 'Development and Validation of a High-Performance Liquid Chromatography Method to Quantify Marker Compounds in Lysimachia vulgaris var. davurica and Its Effects in Diarrhea-Predominant Irritable Bowel Syndrome', Molecules, 29(7), pp. 1489. doi:10.3390/molecules29071489 Preclinical
    https://doi.org/10.3390/molecules29071489
  4. Yildirim, A.B. and Guner, B. and Karakas, F.P. and Turker, A.U (2017) 'Evaluation of Antibacterial, Antitumor, Antioxidant Activities and Phenolic Constituents of Field-Grown and In Vitro-Grown Lysimachia vulgaris L', African Journal of Traditional, Complementary and Alternative Medicines, 14(2), pp. 177-187. doi:10.21010/ajtcam.v14i2.19 Preclinical
    https://doi.org/10.21010/ajtcam.v14i2.19
  5. Kim, S.Y. and Lee, J.Y. and Jhin, C. and Shin, J.M. and Kim, M. and Ahn, H.R. and Yoo, G. and Son, Y. and Jung, S.H. and Nho, C.W (2019) 'Reduction of Hepatic Lipogenesis by Loliolide and Pinoresinol from Lysimachia vulgaris via Degrading Liver X Receptors', Journal of Agricultural and Food Chemistry, 67(45), pp. 12419-12427. doi:10.1021/acs.jafc.9b01488 Preclinical
    https://doi.org/10.1021/acs.jafc.9b01488
  6. Rzadkowska-Bodalska, H. and Olechnowicz-Stepien, W (1975) 'Flavonoids in the herb of yellow loosestrife (Lysimachia vulgaris L.)', Polish Journal of Pharmacology and Pharmacy, 27(3), pp. 345-348. Preclinical
    https://scholar.google.com/scholar?q=Flavonoids%20in%20the%20herb%20of%20yellow%20loosestrife%20%28Lysimachia%20vulgaris%20L.%29
  7. Toth, A. and Vegh, K. and Alberti, A. and Beni, S. and Kery, A (2016) 'A new ultra-high pressure liquid chromatography method for the determination of antioxidant flavonol aglycones in six Lysimachia species', Natural Product Research, 30(20), pp. 2372-2377. doi:10.1080/14786419.2016.1174233 Preclinical
    https://doi.org/10.1080/14786419.2016.1174233
  8. Oiseth, D. and Nordal, A (1952) 'The determination of rutin in Lysimachia vulgaris L', Pharmaceutica Acta Helvetiae, 27(12), pp. 361-363. Preclinical
    https://scholar.google.com/scholar?q=The%20determination%20of%20rutin%20in%20Lysimachia%20vulgaris%20L.
  9. Toth, A. and Toth, G. and Kery, A (2014) 'Polyphenol composition and antioxidant capacity of three Lysimachia species', Natural Product Communications, 9(10), pp. 1473-1478. doi:10.1177/1934578×1400901017 Preclinical
    https://doi.org/10.1177/1934578×1400901017
  10. Zheng, X. and Lv, S. and Wang, W. and Zhu, L. and Lin, L (2025) 'Lysimachia christinae Hance aqueous extract ameliorates renal injury in kidney stone rats and calcium oxalate crystal-induced oxidative stress in HK-2 cells via inhibiting the PI3K/Akt/mTOR pathway', Histology and Histopathology, 41(3), pp. 467-478. doi:10.14670/HH-18-964 Preclinical
    https://doi.org/10.14670/HH-18-964
  11. Kim, H.A. and Lee, D.S. and Lee, H. and Lee, J (2020) 'Lysimachia christinae Hance as an anticancer agent against breast cancer cells', Food Science and Nutrition, 8(10), pp. 5717-5728. doi:10.1002/fsn3.1875 Preclinical
    https://doi.org/10.1002/fsn3.1875
  12. Tian, L.J. and Yang, N.Y. and Chen, W.Q (2008) 'Triterpene saponins from Lysimachia christinae', Journal of Asian Natural Products Research, 10(3), pp. 291-296. doi:10.1080/10286020701605265 Preclinical
    https://doi.org/10.1080/10286020701605265
  13. Li, H.Y. and Hao, Z.B. and Wang, X.L. and Huang, L. and Li, J.P (2008) 'Antioxidant activities of extracts and fractions from Lysimachia foenum-graecum Hance', Bioresource Technology, 100(2), pp. 970-974. doi:10.1016/j.biortech.2008.07.021 Preclinical
    https://doi.org/10.1016/j.biortech.2008.07.021
  14. Hung, N.Q. and Hong Anh, N.T. and Khang, N.S. and Huong, N.T.T. and Luyen, N.T. and Hau, D.V. and Dat, N.T (2021) 'Undescribed chalcone and stilbene constituents from Lysimachia baviensis and their anti-inflammatory effect', Natural Product Research, 37(7), pp. 1138-1145. doi:10.1080/14786419.2021.1994564 Preclinical
    https://doi.org/10.1080/14786419.2021.1994564
  15. Ibrahim, S.R.M. and Mohamed, G.A. and Sharif, A. and Fayed, M.A.A. and Fouda, W.M. and Mohamed, H.M (2026) 'Capilliposides from Lysimachia capillipes: triterpene saponins with potential anticancer activities', Natural Product Research, pp. 1-13. doi:10.1080/14786419.2026.2664710 Meta-analysis / review
    https://doi.org/10.1080/14786419.2026.2664710
  16. Plants For A Future 'Lysimachia vulgaris (Yellow Loosestrife)'. Available at: https://pfaf.org/user/Plant.aspx?LatinName=Lysimachia+vulgaris Traditional / reference
    https://pfaf.org/user/Plant.aspx?LatinName=Lysimachia+vulgaris

This fact sheet is generated automatically from the Omnia Sana plant database and reflects its latest synced data. It is provided for educational purposes only and is not medical advice. How this site is built.

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Educational use only. This profile summarises traditional and scientific sources for reference. It is not medical advice and not a substitute for a qualified practitioner. Some plants carry safety cautions and drug interactions - always check before use.
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