Plant Comparison
Catnip vs Milk Thistle
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.
At a glance
Catnip and Milk Thistle: they share 5 indicated uses (arthritis / joint pain, bloating, indigestion, …); 2 pharmacological actions in common.
Evidence face-off — shared uses
| Condition | Catnip | Milk Thistle | Verdict |
|---|---|---|---|
| Arthritis / joint pain | 1/10 | 5/10 | Stronger for Milk Thistle |
| Bloating | 1/10 | 5/10 | Stronger for Milk Thistle |
| Indigestion | 1/10 | 5/10 | Stronger for Milk Thistle |
| Inflammation (general) | 1/10 | 5/10 | Stronger for Milk Thistle |
| Skin irritation | 1/10 | 5/10 | Stronger for Milk Thistle |
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
The characteristic volatile iridoid responsible for the cat-attractant effect and studied for sedative, antimicrobial and insect-repellent activity.
Rich in nepetalactone isomers along with other monoterpenes; studied for antimicrobial and antioxidant activity.
Pharmacological Actions
Improves glycemic control in type 2 diabetes - lowers fasting blood glucose and HbA1c
Anti-inflammatory and antioxidant; Hepatoprotective / liver support (protects liver cells, antioxidant and antifibrotic)
Digestive support / mild dyspepsia (traditional)
Hepatoprotective / liver support (protects liver cells, antioxidant and antifibrotic); May improve liver enzymes and hepatic fat in non-alcoholic fatty liver disease (NAFLD); Supports liver recovery and 'detox' (traditional framing of the hepatoprotective action)
Traditional & Indicated Uses
inferred from anti-inflammatory action
inferred from digestive action
inferred from antimicrobial action
inferred from anti-inflammatory action
inferred from sedative action
inferred from anti-inflammatory action
inferred from anti-inflammatory action
Improves glycemic control in type 2 diabetes - lowers fasting blood glucose and HbA1c
inferred from anticancer action
Supports liver recovery and 'detox' (traditional framing of the hepatoprotective action)
Digestive support / mild dyspepsia (traditional)
inferred from anti-inflammatory action
Hepatoprotective / liver support (protects liver cells, antioxidant and antifibrotic); May improve liver enzymes and hepatic fat in non-alcoholic fatty liver disease (NAFLD)
inferred from antidiabetic action
Safety, Cautions & Contraindications
Pregnancy: Do not use (traditional concern around stimulating menstruation/uterus) (Health Canada, n.d.). Breastfeeding: Health Canada advises talk to a healthcare professional first (Health Canada, n.d.). Kids: It’s often described as a “gentle” traditional tea, but large amounts are not a good idea—there’s a published case where a toddler became very sleepy/“slowed down” after consuming a lot. Keep catnip tea away from toddlers unless a clinician advises it (Osterhoudt et al., 1997). Sedatives / alcohol: Catnip can be calming, so don’t stack it with other sedating herbs/sleep meds/alcohol (you could get extra drowsy) (WebMD, n.d.a). Essential oil caution: Catnip essential oil is concentrated. Research notes it may cause mild skin irritation for some people—always dilute, patch test, and never treat it like “tea.” (Reichert et al., 2019)
Duke (2002) describes catnip primarily as a sedative, diaphoretic, and emmenagogue with experimental (score 1) support. It has demonstrated uterotonic and oxytocic activity, making it contraindicated in pregnancy. The active compounds include nepetalactone and iridoids. Catnip is classified as a mild nervine and antispasmodic in traditional North American herbal medicine, though clinical trials are lacking. Due to its emmenagogue and uterotonic properties, medicinal-dose use should be avoided during pregnancy (Duke, 2002).
Very well tolerated, even at high doses; the main effects are mild gastrointestinal upset (nausea, loose stools). As a member of the daisy family (Asteraceae), it can cause allergic reactions in sensitive people.
Has a low potential for drug interactions (little effect on liver CYP enzymes), but use caution with medicines that have a narrow therapeutic window. Human pregnancy data are limited, so use cautiously.
External Ids
Botanical Description
Perennial herb, 30-100 cm tall, with greyish-green, downy, square stems typical of the mint family. Leaves are opposite, triangular-ovate with scalloped or toothed margins, grey-green above and softly felted (whitish) beneath, releasing a minty-lemony aroma when crushed. Small white flowers, spotted with purple or pink, are borne in dense terminal and axillary spikes. Nepetalactone, the volatile compound famous for its effect on cats, is concentrated in glandular hairs on the leaves and stems.[9]
Robust biennial (occasionally annual) thistle (Asteraceae), 30-150 cm tall. Leaves are glossy dark green with distinctive white marbled veining (the 'milk' of legend), spiny-margined and deeply lobed. Large, solitary, purple-pink thistle-type flower heads are surrounded by spiny bracts, followed by shiny, mottled brown-black seeds - the part used.[12]
Habitat
Native to Europe and temperate Asia and widely naturalised in North America; grows on disturbed, sunny ground - roadsides, waste places, hedgebanks and dry, calcareous or well-drained soils.[9]
Native to the Mediterranean region, now naturalised worldwide on disturbed, sunny ground - roadsides, waste places and dry pastures - and widely cultivated commercially for its seed.[12]
Harvesting
Seed heads are harvested once fully dry (late summer), and the seeds (fruit) are threshed out.[12]
Traditional Uses
Catnip has a long North American and European folk-medicine history as a mild sedative/nervine, diaphoretic (fever-reducing, sweat-promoting) remedy, carminative digestive and traditional emmenagogue; it was also given as a children's tea for colic and restlessness, though large amounts are not advised for young children and it is traditionally avoided in pregnancy.[9]
Milk thistle has a very long European folk-medicine tradition, documented since antiquity, as a liver tonic, and its seed extract, standardised to the flavonolignan complex silymarin, is one of the most extensively studied herbal hepatoprotectants. Modern research supports antioxidant, anti-inflammatory and liver-protective activity, with growing interest in metabolic/blood-sugar effects.[12, 13]
Preparations
Dosage
Health Canada's NNHPD monograph gives 1.2-12 g of dried herb top per day for adults 18 years and older, with infusion among the accepted methods of preparation. Educational reference only, not a prescription. Keep away from toddlers and young children beyond very small amounts, and avoid medicinal-dose use in pregnancy.
References
Drug Class Interactions
Lookalikes Review
References & Sources
- Geissler, M., Neubauer, C., Sheludko, Y.V. and Warzecha, H (2024) 'Nepeta cataria L. (catnip) can serve as a chassis for the engineering of secondary metabolic pathways', Biotechnology Letters, 46(5), pp. 843-850. doi:10.1007/s10529-024-03489-w Preclinical
https://doi.org/10.1007/s10529-024-03489-w - Lockhart, A., Simon, J.E. and Wu, Q (2024) 'Stability study of Nepeta cataria iridoids analyzed by LC/MS', Phytochemical Analysis, 35(7), pp. 1674-1687. doi:10.1002/pca.3410 Preclinical
https://doi.org/10.1002/pca.3410 - Nadeem, A., Shahzad, H., Ahmed, B., Muntean, T. and others (2022) 'Phytochemical profiling of antimicrobial and potential antioxidant plant: Nepeta cataria', Frontiers in Plant Science, 13, pp. 969316. doi:10.3389/fpls.2022.969316 Preclinical
https://doi.org/10.3389/fpls.2022.969316 - Tan, J., Li, J., Ma, J. and Qiao, F (2019) 'Hepatoprotective effect of essential oils of Nepeta cataria L. on acetaminophen-induced liver dysfunction', Bioscience Reports, 39(8), pp. BSR20190697. doi:10.1042/BSR20190697 Preclinical
https://doi.org/10.1042/BSR20190697 - Mollova, S., Dzhurmanski, A., Fidan, H., Bojilov, D. and others (2023) 'Chemical Composition of Essential Oils from Nepeta cataria L. Cultivated in Bulgaria and Their Antimicrobial and Antioxidant Activity', ACS Omega, 8(17), pp. 15441-15449. doi:10.1021/acsomega.3c00704 Preclinical
https://doi.org/10.1021/acsomega.3c00704 - Reichert, W., Ejercito, J., Guda, T., Dong, X. and others (2019) 'Repellency Assessment of Nepeta cataria Essential Oils and Isolated Nepetalactones on Aedes aegypti', Scientific Reports, 9(1), pp. 1524. doi:10.1038/s41598-018-36814-1 Preclinical
https://doi.org/10.1038/s41598-018-36814-1 - Tiwari, G., Chaturvedi, T., Gupta, A.K., Lal, R.K. and others (2023) 'Assessment of Genetic Diversity, Micromorphology and Antimicrobial Activity in Nepeta cataria L', Chemistry & Biodiversity, 20(2), pp. e202200241. doi:10.1002/cbdv.202200241 Preclinical
https://doi.org/10.1002/cbdv.202200241 - Giarratana, F., Muscolino, D., Ziino, G., Lo Presti, V. and others (2017) 'Activity of Catmint (Nepeta cataria) essential oil against Anisakis larvae', Tropical Biomedicine, 34(1), pp. 22-31. Available at: https://pubmed.ncbi.nlm.nih.gov/33592976/ Preclinical
https://pubmed.ncbi.nlm.nih.gov/33592976/ - Sarkar, M., Rashmi, R., Vikramaditya and Varma, P.N (1995) 'Pharmacognosy of Nepeta cataria', Ancient Science of Life, 14(4), pp. 225-234. Available at: https://pubmed.ncbi.nlm.nih.gov/22556702/ Traditional / reference
https://pubmed.ncbi.nlm.nih.gov/22556702/ - Bernardi, M.M., Kirsten, T.B., Lago, J.H.G., Giovani, T.M. and Massoco, C.O (2011) 'Nepeta cataria L. var. citriodora (Becker) increases penile erection in rats', Journal of Ethnopharmacology, 137(3), pp. 1318-1322. doi:10.1016/j.jep.2011.07.061 Preclinical
https://doi.org/10.1016/j.jep.2011.07.061 - Health Canada, Natural and Non-prescription Health Products Directorate (2026) 'Natural Health Product Monograph: Catnip - Nepeta cataria'. Available at: https://webprod.hc-sc.gc.ca/nhpid-bdipsn/dbImages/mono_catnip_english.pdf Traditional / reference
https://webprod.hc-sc.gc.ca/nhpid-bdipsn/dbImages/mono_catnip_english.pdf - British Herbal Medicine Association (1983) 'British Herbal Pharmacopoeia'. Traditional / reference
https://scholar.google.com/scholar?q=British%20Herbal%20Pharmacopoeia - Gilani, A.H., Shah, A.J., Zubair, A., Khalid, S., Kiani, J., Ahmed, A., Rasheed, M. and Ahmad, V.U (2009) 'Chemical composition and mechanisms underlying the spasmolytic and bronchodilatory properties of the essential oil of Nepeta cataria L', 121(3), pp. 405--411. doi:10.1016/j.jep.2008.11.004 Traditional / reference
https://doi.org/10.1016/j.jep.2008.11.004 - Royal Botanic Gardens, Kew (n.d.). Available at: https://powo.science.kew.org Traditional / reference
https://powo.science.kew.org - 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
- Abenavoli, L., Izzo, A.A., Milic, N., Cicala, C., Santini, A. and Capasso, R (2018) 'Milk thistle (Silybum marianum): A concise overview on its chemistry, pharmacological, and nutraceutical uses in liver diseases', Phytotherapy Research, 32(11), pp. 2202-2213. doi:10.1002/ptr.6171 Meta-analysis / review
https://doi.org/10.1002/ptr.6171 - Bahmani, M., Shirzad, H., Rafieian, S. and Rafieian-Kopaei, M (2015) 'Silybum marianum: Beyond Hepatoprotection', Journal of Evidence-Based Complementary & Alternative Medicine, 20(4), pp. 292-301. doi:10.1177/2156587215571116 Meta-analysis / review
https://doi.org/10.1177/2156587215571116 - Wang, X., Zhang, Z. and Wu, S (2020) 'Health Benefits of Silybum marianum: Phytochemistry, Pharmacology, and Applications', Journal of Agricultural and Food Chemistry, 68(42), pp. 11644-11664. doi:10.1021/acs.jafc.0c04791 Meta-analysis / review
https://doi.org/10.1021/acs.jafc.0c04791 - Marmouzi, I., Bouyahya, A., Ezzat, S.M., El Jemli, M. and Kharbach, M (2020) 'The food plant Silybum marianum (L.) Gaertn.: Phytochemistry, Ethnopharmacology and clinical evidence', Journal of Ethnopharmacology, 265, pp. 113303. doi:10.1016/j.jep.2020.113303 Meta-analysis / review
https://doi.org/10.1016/j.jep.2020.113303 - Greenlee, H., Abascal, K., Yarnell, E. and Ladas, E (2007) 'Clinical applications of Silybum marianum in oncology', Integrative Cancer Therapies, 6(2), pp. 158-165. doi:10.1177/1534735407301727 Meta-analysis / review
https://doi.org/10.1177/1534735407301727 - Shaker, E., Mahmoud, H. and Mnaa, S (2009) 'Silymarin, the antioxidant component and Silybum marianum extracts prevent liver damage', Food and Chemical Toxicology, 48(3), pp. 803-806. doi:10.1016/j.fct.2009.12.011 Preclinical
https://doi.org/10.1016/j.fct.2009.12.011 - Flora, K., Hahn, M., Rosen, H. and Benner, K (1998) 'Milk thistle (Silybum marianum) for the therapy of liver disease', American Journal of Gastroenterology, 93(2), pp. 139-143. doi:10.1111/j.1572-0241.1998.00139.x Meta-analysis / review
https://doi.org/10.1111/j.1572-0241.1998.00139.x - Csupor, D., Csorba, A. and Hohmann, J (2016) 'Recent advances in the analysis of flavonolignans of Silybum marianum', Journal of Pharmaceutical and Biomedical Analysis, 130, pp. 301-317. doi:10.1016/j.jpba.2016.05.034 Meta-analysis / review
https://doi.org/10.1016/j.jpba.2016.05.034 - Ball, K.R. and Kowdley, K.V (2005) 'A review of Silybum marianum (milk thistle) as a treatment for alcoholic liver disease', Journal of Clinical Gastroenterology, 39(6), pp. 520-528. doi:10.1097/01.mcg.0000165668.79530.a0 Meta-analysis / review
https://doi.org/10.1097/01.mcg.0000165668.79530.a0 - Tajmohammadi, A., Razavi, B.M. and Hosseinzadeh, H (2018) 'Silybum marianum (milk thistle) and its main constituent, silymarin, as a potential therapeutic plant in metabolic syndrome: A review', Phytotherapy Research, 32(10), pp. 1933-1949. doi:10.1002/ptr.6153 Meta-analysis / review
https://doi.org/10.1002/ptr.6153 - Ghahfarrokhi, S.H., Heidari-Soureshjani, S., Sherwin, C.M.T. and Azadegan-Dehkordi, Z (2024) 'Efficacy and Mechanisms of Silybum marianum, Silymarin, and Silibinin on Rheumatoid Arthritis and Osteoarthritis Symptoms: A Systematic Review', Current Rheumatology Reviews, 20(4), pp. 414-425. doi:10.2174/0115733971266397231122080247 Meta-analysis / review
https://doi.org/10.2174/0115733971266397231122080247 - Soleimani, V., Delghandi, P.S., Moallem, S.A. and Karimi, G (2019) 'Safety and toxicity of silymarin, the major constituent of milk thistle extract: An updated review', Phytotherapy Research. doi:10.1002/ptr.6361 Randomized trial
https://doi.org/10.1002/ptr.6361 - Fallah, M., Davoodvandi, A., Nikmanzar, S., Aghili, S., Mirazimi, S.M.A., Aschner, M., Rashidian, A., Hamblin, M.R., Chamanara, M., Naghsh, N. and Mirzaei, H (2021) 'Silymarin (milk thistle extract) as a therapeutic agent in gastrointestinal cancer', Biomedicine & Pharmacotherapy. doi:10.1016/j.biopha.2021.112024 Preclinical
https://doi.org/10.1016/j.biopha.2021.112024 - Voroneanu, L., Nistor, I., Dumea, R., Apetrii, M. and Covic, A (2016) 'Silymarin in Type 2 Diabetes Mellitus: A Systematic Review and Meta-Analysis of Randomized Controlled Trials', Journal of Diabetes Research. doi:10.1155/2016/5147468 Meta-analysis / review
https://doi.org/10.1155/2016/5147468 - Zhou, J., Chen, Y., Yu, J., Li, T., Lu, Z., Chen, Y., Zhang, X. and Ye, F (2021) 'The efficacy of novel metabolic targeted agents and natural plant drugs for nonalcoholic fatty liver disease treatment: A PRISMA-compliant network meta-analysis of randomized controlled trials', Medicine (Baltimore), 100(12). doi:10.1097/MD.0000000000024884 Meta-analysis / review
https://doi.org/10.1097/MD.0000000000024884 - Fuhr, U., Beckmann-Knopp, S., Jetter, A., Lueck, H. and Mengs, U (2007) 'The effect of silymarin on oral nifedipine pharmacokinetics', Planta Medica, 73(14), pp. 1429-1435. doi:10.1055/s-2007-990256 Randomized trial
https://doi.org/10.1055/s-2007-990256 - Hadi, A., Pourmasoumi, M., Mohammadi, H., Symonds, M. and Miraghajani, M (2018) 'The effects of silymarin supplementation on metabolic status and oxidative stress in patients with type 2 diabetes mellitus: A systematic review and meta-analysis of clinical trials', Complementary Therapies in Medicine, 41, pp. 311-319. doi:10.1016/j.ctim.2018.08.010 Meta-analysis / review
https://doi.org/10.1016/j.ctim.2018.08.010
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.