Plant Profile

Blessed Thistle

Cnicus benedictus
Family: Asteraceae  ·  Parts used: Aerial parts (flowering herb)  ·  Also known as: Holy thistle, St Benedict's thistle, Spotted thistle

The complete database record: 3 documented constituents, 7 pharmacological actions, 10 traditional / indicated uses, with 13 cited sources.

Botanical Description

Branching annual herb with a hairy, reddish, ridged stem and spiny, deeply lobed leaves with prominent pale veins. The flower heads are pale yellow, thistle-like, surrounded by a whorl of spiny, leaf-like bracts, giving the plant its 'spotted thistle' appearance.[4]

Height: 20-60 cm
Habit: Branching, hairy annual herb
Leaves: Spiny, deeply lobed, with prominent pale veins
Flowers: Pale yellow, thistle-like flower heads surrounded by spiny bracts
Stem: Hairy, reddish, ridged, branching
Root: Shallow taproot
Fruit: Ribbed achene with a feathery pappus
Flowering Period: June-August

Habitat & Distribution

Grows on dry, sunny waste ground, roadsides and rocky slopes; native to the Mediterranean region and Western Asia and naturalised elsewhere as a garden escape.[4]

Harvesting

The flowering aerial parts are cut as the plant comes into flower, in summer, and dried in a warm, shaded, airy place to preserve the bitter principle cnicin.[4]

Parts: Aerial parts (flowering herb)
Season: Summer, at flowering

Key Constituents

Sesquiterpene lactones (cnicin, arctigenin, arctiin)[4]

Cnicin is the principal bitter principle and main bioactive compound.

Sesquiterpene lactonesSesquiterpenesArctigenin / arctiin
Flavonoids, lignans and tannins[4]

Additional antioxidant and astringent constituents.

FlavonoidsLignansTannins
Volatile oil[4]

Aromatic constituents of the herb.

Essential (volatile) oil

Pharmacological Actions

Anti-inflammatory[1, 4, 7]

Antimicrobial and anti-inflammatory (attributed to cnicin)

Anticancer (preclinical)[5]
Antimicrobial[1, 4, 6]

Antimicrobial and anti-inflammatory (attributed to cnicin)

Appetite stimulant[4, 12]

Appetite stimulant for loss of appetite (approved use under German Commission E)

Bitter digestive tonic / stomachic[4, 12]

Bitter digestive / stomachic for indigestion and dyspepsia (stimulates saliva and gastric secretion)

Digestive aid[4, 12]

Bitter digestive / stomachic for indigestion and dyspepsia (stimulates saliva and gastric secretion)

Galactagogue (supports lactation)[12, 13]

Galactagogue to support breast-milk supply (traditional; no valid clinical-trial evidence)

Traditional & Indicated Uses

Loss of appetite[4, 12]Preliminary · 1/10

Appetite stimulant for loss of appetite (approved use under German Commission E)

Evidence: 1
Label: Loss of appetite

more plants for loss of appetite →detailed sources →

Arthritis / joint pain[4]Preliminary · 1/10

inferred from anti-inflammatory action

Evidence: 1
Label: Arthritis / joint pain

more plants for arthritis / joint pain →detailed sources →

Bloating[4, 12]Preliminary · 1/10

inferred from digestive action

Evidence: 1
Label: Bloating

more plants for bloating →detailed sources →

Cancer (anticancer research)[5]Preliminary · 2/10

inferred from anticancer action

Evidence: 2
Label: Cancer (anticancer research)

more plants for cancer (anticancer research) →detailed sources →

Indigestion[4, 12]Preliminary · 1/10

Bitter digestive / stomachic for indigestion and dyspepsia (stimulates saliva and gastric secretion)

Evidence: 1
Label: Indigestion

more plants for indigestion →detailed sources →

Infection (general)[4]Preliminary · 1/10

inferred from antimicrobial action

Evidence: 1
Label: Infection (general)

more plants for infection (general) →detailed sources →

Inflammation (general)[4]Preliminary · 1/10

inferred from anti-inflammatory action

Evidence: 1
Label: Inflammation (general)

more plants for inflammation (general) →detailed sources →

Lactation support[12, 13]Preliminary · 1/10

Galactagogue to support breast-milk supply (traditional; no valid clinical-trial evidence)

Evidence: 1
Label: Lactation support

more plants for lactation support →detailed sources →

Skin irritation[4]Preliminary · 1/10

inferred from anti-inflammatory action

Evidence: 1
Label: Skin irritation

more plants for skin irritation →detailed sources →

Wounds[4]Preliminary · 1/10

inferred from antimicrobial action

Evidence: 1
Label: Wounds

more plants for wounds →detailed sources →

Traditional Use & History

Blessed thistle has a long European folk reputation as a bitter digestive tonic for loss of appetite and dyspepsia (an approved use under German Commission E) and, more anecdotally, as a traditional galactagogue to support breast-milk supply, though robust clinical evidence for the latter is lacking.[4, 12]

Preparations

Infusion[12]

Dried flowering herb infused briefly in hot water as a bitter digestive tea, taken before meals.

Dosage

Infusion[12]

Traditional herbal references suggest around 1-2 g of dried herb per cup, taken before meals, up to three times daily. Educational reference only, not a prescription.

Safety, Cautions & Contraindications

Safety note[12]Info

As a member of the daisy family (Asteraceae/ragweed), it can cause allergic reactions in sensitive people; high doses reportedly cause stomach cramps, nausea and vomiting.

Safety note[12]Caution

Avoid during pregnancy because of a traditional uterine-stimulating reputation.

Safety note[13]Info

Although traditionally used to support milk supply, there is no scientifically valid clinical evidence for the galactagogue use.

Harvest Readiness

[11]

Part: aerial-parts
Signals: Gather the flowering herb (leaf, flower and leafy stem) in summer as the plant comes into flower; dry for use.
Basis: traditional
Source Quote: The plant is harvested in the summer as it comes into flower and is dried for later use
Species Confirmed: 1
Notes: Useful Temperate Plants (REF-3232) for Cnicus benedictus. Single source -> provisional.

External Identifiers

References & Sources

  1. Rezig, K., Benkaci-Ali, F., Foucaunier, M.L., Laurent, S. et al (2023) 'HPLC/ESI-MS Characterization of Phenolic Compounds from Cnicus benedictus L. Roots: A Study of Antioxidant, Antibacterial, Anti-Inflammatory, and Anti-Alzheimer's Activity', Chemistry & Biodiversity, 21(1), pp. e202300724. doi:10.1002/cbdv.202300724 Preclinical
    https://doi.org/10.1002/cbdv.202300724
  2. Ahmadimoghaddam, D., Sadeghian, R., Ranjbar, A., Izadidastenaei, Z. and Mohammadi, S (2020) 'Antinociceptive activity of Cnicus benedictus L. leaf extract: a mechanistic evaluation', Research in Pharmaceutical Sciences, 15(5), pp. 463-472. doi:10.4103/1735-5362.297849 Preclinical
    https://doi.org/10.4103/1735-5362.297849
  3. Zhang, J., Shen, S., Zhu, S., Jia, F. et al (2024) 'Cnicus benedictus extract-loaded electrospun gelatin wound dressing for treating diabetic wounds: An in vitro and in vivo study', Journal of Applied Biomaterials & Functional Materials, 22, pp. 22808000241245298. doi:10.1177/22808000241245298 Preclinical
    https://doi.org/10.1177/22808000241245298
  4. Zietal, K., Mirowska-Guzel, D., Nowaczyk, A. and Blecharz-Klin, K (2024) 'Cnicus benedictus: Folk Medicinal Uses, Biological Activities, and In Silico Screening of Main Phytochemical Constituents', Planta Medica. doi:10.1055/a-2401-6049 Traditional / reference
    https://doi.org/10.1055/a-2401-6049
  5. Jalil, D.M., Al-Mahdawi, T.T., Jameel, M.G. and Talal, M (2024) 'In Vitro Evaluate the Antiproliferative Impact of Cnicus Benedictus L. Leaves Methanolic Extract on Cervical Cancer', Asian Pacific Journal of Cancer Prevention, 25(10), pp. 3643-3649. doi:10.31557/APJCP.2024.25.10.3643 Preclinical
    https://doi.org/10.31557/APJCP.2024.25.10.3643
  6. Peng, Y., Jian, Y., Zulfiqar, A., Li, B., Zhang, K., Long, F., Peng, C., Cai, X., Khan, I.A. and Wang, W (2017) 'Two new sesquiterpene lactone glycosides from Cnicus benedictus', Natural Product Research, 31(19), pp. 2211-2217. doi:10.1080/14786419.2017.1295239 Preclinical
    https://doi.org/10.1080/14786419.2017.1295239
  7. Paun, G., Neagu, E., Moroeanu, V., Albu, C., Savin, S. and Lucian Radu, G (2019) 'Chemical and Bioactivity Evaluation of Cnicus benedictus and Eryngium planum Polyphenolic-Rich Extracts', BioMed Research International, 2019, pp. 3692605. doi:10.1155/2019/3692605 Preclinical
    https://doi.org/10.1155/2019/3692605
  8. Gobrecht, P., Gebel, J., Leibinger, M., Zeitler, C., Chen, Z., Grundemann, D. and Fischer, D (2024) 'Cnicin promotes functional nerve regeneration', Phytomedicine, 129, pp. 155641. doi:10.1016/j.phymed.2024.155641 Preclinical
    https://doi.org/10.1016/j.phymed.2024.155641
  9. Avula, B., Katragunta, K., Wang, Y.H., Ali, Z. and Khan, I.A (2022) 'Simultaneous determination and characterization of flavonoids, sesquiterpene lactone, and other phenolics from Centaurea benedicta and dietary supplements using UHPLC-PDA-MS and LC-DAD-QToF', Journal of Pharmaceutical and Biomedical Analysis, 216, pp. 114806. doi:10.1016/j.jpba.2022.114806 Preclinical
    https://doi.org/10.1016/j.jpba.2022.114806
  10. Paun, G., Neagu, E., Albu, C. and Radu, G.L (2015) 'Inhibitory potential of some Romanian medicinal plants against enzymes linked to neurodegenerative diseases and their antioxidant activity', Pharmacognosy Magazine, 11(Suppl 1), pp. S110-S116. doi:10.4103/0973-1296.157709 Preclinical
    https://doi.org/10.4103/0973-1296.157709
  11. Fern, Ken 'Cnicus benedictus (Blessed Thistle) — Useful Temperate Plants'. Available at: https://temperate.theferns.info/plant/Cnicus+benedictus Traditional / reference
    https://temperate.theferns.info/plant/Cnicus+benedictus
  12. Drugs.com (n.d.) 'Blessed Thistle Uses, Benefits & Dosage'. Available at: https://www.drugs.com/npp/blessed-thistle.html Traditional / reference
    https://www.drugs.com/npp/blessed-thistle.html
  13. Drugs and Lactation Database (LactMed) (2021) 'Blessed Thistle'. Available at: https://www.ncbi.nlm.nih.gov/books/NBK501775/ Traditional / reference
    https://www.ncbi.nlm.nih.gov/books/NBK501775/

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.

Selected studies & references

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.
This profile is assembled automatically from the Omnia Sana plant database, which we curate by hand. How this site is built.
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