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Dietary supplement

Watercress Ingredients & Drug Interactions

by Herbalist & Alchemist

Watercress label
See full label image
Liquid Category: Botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Watercress against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Watercress is a dietary supplement by Herbalist & Alchemist with 1 active ingredient. Its ingredients are commonly taken for source of vitamins and minerals, antioxidant support, general nutrition.Based on those ingredients, 6 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are fresh Watercress herb extract. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Watercress by Herbalist & Alchemist

Ask about any prescription or over-the-counter medication and we check it for interactions with Watercress by Herbalist & Alchemist — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Watercress by Herbalist & Alchemist

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 11, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

This product has 1 active ingredient: fresh watercress herb extract in a liquid form, combined with distilled water and ethyl alcohol as the delivery base. Watercress is a leafy green vegetable used as an herbal supplement for its nutrient content.

Does it work?

Couldn't assess
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Not assessable

We hold no graded evidence for this product's ingredients for its stated purpose.

Why this rating?
  • The label markets this product for: promotes healthy liver function.
  • We looked for evidence on: liver health, hepatic function, detoxification.
  • Our graded evidence for these ingredients doesn't cover that particular purpose.

We don't have effectiveness ratings on file for watercress, so we can't tell you from our data whether it works for any particular health goal. If you're considering this product for a specific reason, talk with your pharmacist about what the evidence shows.

The evidence, ingredient by ingredient Watercress

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Watercress is generally well tolerated when you eat it in normal food amounts. This product is a concentrated liquid extract, though, and safety data for medicinal doses is limited — so be cautious with it.

In excessive doses, watercress can irritate your stomach and intestines. Raw, wild watercress can carry parasitic flukes that cause a liver infection called fascioliasis, though the extract here is processed.

If you apply watercress to your skin, it can trigger contact dermatitis (a rash with itching, hives, or swelling).

Side effects, ingredient by ingredient Watercress

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Watercress.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; lithium.
  • For scale: 6 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Check with your pharmacist or doctor before taking this product if you're on lithium, chlorzoxazone (a muscle relaxant), or warfarin (a blood thinner). These are Moderate-severity interactions, and your medication may need adjusting or this product may not be right for you.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with no assessable stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

If you eat watercress as a vegetable, you're fine. This concentrated extract, though, is different — it interacts with lithium, certain muscle relaxants, and blood thinners, and the safety data for medicinal use is thin.

Talk with your pharmacist before you start, especially if you take any prescription medications.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Sep 21, 2018.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Watercress, straight from the product label.

Brand Herbalist & Alchemist
Barcode (UPC) 667056129125
Net contents 2 fl. Oz.; 60 mL
Market status On market
Date entered into DSLD Sep 21, 2018
DSLD ID 180760
Product type Botanical
Supplement form Liquid
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Kosher
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Watercress by Herbalist & Alchemist, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
1.5 mL
Maximum serving Sizes:
2 mL
Servings per container
30
UPC/BARCODE
667056129125
IngredientAmount% DV
fresh Watercress herb extract2 mL--

Other ingredients: distilled Water, Ethyl Alcohol

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Formula

Rorippa nasturtium-aquaticum

OK

General Statements

Promotes healthy liver function

Botanical preparation ratio 1:2

FDA Statement of Identity

Herbal Supplement

Suggested/Recommended/Usage/Directions

Suggested use: 30-40 drops (1.5-2 mL) in juice or water. Take 4 times per day. Shake well before using.

Precautions

Keep out of children's reach

FDA Disclaimer Statement

This statement has not been evaluated by the FDA. This product is not intended to diagnose, treat, cure or prevent any disease.

General

NO. WTC-2 1747TU

Seals/Symbols

OK

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Watercress by Herbalist & Alchemist label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Watercress label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Watercress by Herbalist & Alchemist

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size1.5 mL Dosage formLiquid Servings per container30 Amounts shown are per serving.

Fresh Watercress herb extract

Interacts with
6 drugs
2 mL per serving

Watercress is a nutrient-rich leafy green that provides vitamins A, C, and K plus minerals and antioxidant plant compounds. Eaten as a food it is gene...

Fresh Watercress herb extract monograph & interactions

Other (inactive) ingredients: Distilled Water, Ethyl Alcohol. These complete the product’s ingredient list but are not active constituents.

Interaction report

Watercress by Herbalist & Alchemist Drug Interactions

Want to check YOUR meds against Watercress?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
6Drugs
6 Moderate

Ingredients driving the most interactions

fresh Watercress herb extract 6

Individual Drug Interactions

The ingredients in Watercress interact with 6 drugs. Click any drug to see the details.

1 of the 1 ingredient in Watercress interact with drugs. Each result below shows which ingredient is responsible. fresh Watercress herb extract

Each ingredient & the kinds of drugs it affects

For each ingredient in Watercress with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

fresh Watercress herb extract3 drug types · 6 drugs

Chlorzoxazone (Parafon Forte, Paraflex)

Watercress might reduce the metabolism of chlorzoxazone and increase its effects and side effects. Clinical research in healthy volunteers shows that a single ingestion of watercress 50 grams increases the chlorzoxazone plasma concentration-time curve by about 56% and increases its half-life by about 53%.

Likelihood Probable Evidence B
Lithium

Watercress is thought to have diuretic properties. Theoretically, due to these potential diuretic effects, watercress might reduce excretion and increase levels of lithium.

Likelihood Probable Evidence D
Warfarin (Coumadin)

Watercress contains vitamin K. Consuming large amounts of watercress might antagonize the anticoagulant effects of warfarin.

Likelihood Possible Evidence B
fresh Watercress herb extract full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Watercress, from the product label.

Herbalist & Alchemist

See all Herbalist & Alchemist products
Name
Herbalist & Alchemist, Inc.
City
Washington
State
NJ
ZipCode
07882
Phone Number
800-611-8235
Web Address
www.herbalist-alchemist.com
Pharmacist Counseling Corner

Watercress by Herbalist & Alchemist: Common Questions

Does Watercress by Herbalist & Alchemist interact with any medications?
Yes. Based on its ingredients, Watercress has a known interaction with 6 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Watercress contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Is this safe if I eat watercress as a salad?
Yes — watercress in normal food amounts is safe for most adults. This product is a concentrated liquid extract, though, so it's a different story. We recommend sticking with food amounts unless you've talked to your pharmacist first.
What happens if watercress gets on my skin?
Watercress can cause contact dermatitis — a rash, hives, itching, or swelling where it touches you. Wash it off right away if that happens and rinse the area well.
What are the side effects of taking too much?
High doses can irritate your stomach and intestines. Raw, wild watercress can also carry parasitic flukes that cause liver disease, though the exact contamination risk from this processed extract isn't clear from the data we have.
Can I take this while pregnant or breastfeeding?
We don't have safety data on file for watercress in pregnancy or lactation. Talk with your doctor or pharmacist to see if it's right for you in either situation.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Watercress label
Go deeper

The Full Monographs Behind Watercress’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Watercress

Interacts with 6 drugs

Watercress is a nutrient-rich leafy green that provides vitamins A, C, and K plus minerals and antioxidant plant compounds. Eaten as a food it is generally safe and healthy for most people,...

Read the full Watercress monograph →
Sources

Sources & How We Checked

Watercress's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 34 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Watercress 34 references
  1. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
  2. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.
  3. Leclercq I, Desager JP, Horsmans Y. Inhibition of chlorzoxazone metabolism, a clinical probe for CYP2E1, by a single ingestion of watercress. Clin Pharmacol Ther 1998;64:144-9. PubMed
  4. Bolton-Smith C, Price RJ, Fenton ST, et al. Compilation of a provisional UK database for the phylloquinone (vitamin K1) content of foods. Br J Nutr 2000;83:389-99.
  5. Rondelaud, D., Dreyfuss, G., Bouteille, B., and Darde, M. L. Changes in human fasciolosis in a temperate area: about some observations over a 28-year period in central France. Parasitol.Res 2000;86(9):753-757. PubMed
  6. Sanchez-Sosa, S., Rojas-Ortega, S., Reed-San Roman, G., and Torres-Santana, M. A. [Massive hepatobiliary fascioliasis]. Rev Gastroenterol.Mex. 2000;65(4):179-183.
  7. van Daele, P. L., Madretsma, G. S., and van Agtmael, M. A. [Stomach ache and fever after consumption of watercress in Turkey: fascioliasis]. Ned.Tijdschr.Geneeskd. 9-29-2001;145(39):1896-1899.
  8. Cosme, A., Ojeda, E., Cilla, G., Torrado, J., Alzate, L., Beristain, X., Orive, V., and Arenas, J. [Fasciola hepatica. study of a series of 37 patients]. Gastroenterol.Hepatol. 2001;24(8):375-380.
  9. Martinez-Bebert, K., Rodriguez-Baez, R., Pila-Perez, R., Pila-Pelaez, R., and Tamakloe, K. [Hepatic hematoma caused by fascioliasis]. Gac.Med Mex. 2002;138(3):271-274.
  10. Dreyfuss, G., Vignoles, P., Abrous, M., and Rondelaud, D. Unusual snail species involved in the transmission of Fasciola hepatica in watercress beds in central France. Parasite 2002;9(2):113-120.
  11. Christmann, M., Henrich, R., Mayer, G., and Ell, C. [Infection with fasciola hepatica causing elevated liver-enzyme results and eosinophilia - serologic and endoscopic diagnosis and therapy]. Z.Gastroenterol. 2002;40(9):801-806.
  12. Cosme, A., Ojeda, E., Poch, M., Bujanda, L., Castiella, A., and Fernandez, J. Sonographic findings of hepatic lesions in human fascioliasis. J Clin Ultrasound 2003;31(7):358-363. PubMed
  13. Sapunar, J., Latorre, R., Guerra, M., and Defilippi, C. [Clinical considerations on 2 cases of hepatic fascioliasis. Importance of the imaging examinations]. Bol.Chil.Parasitol. 1992;47(3-4):70-76.
  14. de Gorgolas, M., Torres, R., Verdejo, C., Garay, J., Robledo, A., Ponte, M. C., and Fernandez Guerrero, M. L. [Fasciola hepatica infestation. Biopathology and new diagnostic and therapeutic aspects]. Enferm.Infecc.Microbiol.Clin 1992;10(9):514-519.
  15. Carrada-Bravo, T. [Fascioliasis: diagnosis, epidemiology and treatment]. Rev Gastroenterol.Mex. 2003;68(2):135-142.
  16. Yilmaz, H. and Godekmerdan, A. Human fasciolosis in Van province, Turkey. Acta Trop. 2004;92(2):161-162.
  17. Dobrucali, A., Yigitbasi, R., Erzin, Y., Sunamak, O., Polat, E., and Yakar, H. Fasciola hepatica infestation as a very rare cause of extrahepatic cholestasis. World J Gastroenterol. 10-15-2004;10(20):3076-3077. PubMed
  18. Alvarez-Chacon, R., Garcia-Rosales, J. J., de la Cruz-Otero MC, Wong-Chio, M., Cabrera-Bravo, M., Gomez-Gomez, J. V., and Gamez-Aranda, V. [Fascioliasis in children. A study of 10 cases]. Bol.Med Hosp.Infant Mex. 1992;49(6):365-371.
  19. Mailles, A., Capek, I., Ajana, F., Schepens, C., Ilef, D., and Vaillant, V. Commercial watercress as an emerging source of fascioliasis in Northern France in 2002: results from an outbreak investigation. Epidemiol.Infect. 2006;134(5):942-945.
  20. Cruz, Lopez O., Adan, Pimentel A., Tamariz Cruz, O. J., Munoz, Lopez A., Cruz Lopez, M. C., Cruz Lopez, M. E., and Munoz, Lopez S. [Hepatic fasciolasis diagnosed in state phase]. Rev Gastroenterol Mex. 2006;71(1):59-62.
  21. el Shazly, A. M., Handousa, A. E., Youssef, M. E., Rizk, H., and Hamouda, M. M. Human fascioliasis: a parasitic health problem in Dakahlia Governorate, Egypt. J Egypt.Soc Parasitol. 1991;21(2):553-559.
  22. Cosme, A., Alzate, L., Orive, V., Recasens, M., Torrado, J., Ruiz, I., and Arenas, J. [Laparoscopic findings in liver fascioliasis. Study of 13 cases]. Rev Esp.Enferm.Dig. 1990;78(6):359-362.
  23. Diaz, J., Pina, B., Lastre, M., Rivera, L., and Perez, O. [Epidemic human fascioliasis. Cuba 1983. VI. Clinical study of 40 children in the Hospital Provincial of Sagua la Grande]. G.E.N. 1990;44(4):385-388.
  24. Borie, C., Corona, S., Garin, A., Olea, P., Salcedo, M., Perez, C., and Apt, W. [A family outbreak of acute hepatic fascioliasis]. Rev Med Chil. 1990;118(1):67-72.
  25. Diamond, S. P., Wiener, S. G., and Marks, J. G., Jr. Allergic contact dermatitis to nasturtium. Dermatol.Clin. 1990;8(1):77-80. DOI
  26. Delasalle, P., Beytout, J., Cambon, M., and Bommelaer, G. [Distomatosis: diagnosis and treatment]. Rev Prat. 1-21-1990;40(3):230-236.
  27. Rivera, J. V. and Bermudez, R. H. Radionuclide imaging of the liver in human fascioliasis. Clin Nucl.Med 1984;9(8):450-453. PubMed
  28. Croese, J., Chapman, G., and Gallagher, N. D. Evolution of fascioliasis after eating wild watercress. Aust.N.Z.J.Med. 1982;12(5):525-527. PubMed
  29. Bendezu, P., Frame, A., and Hillyer, G. V. Human fascioliasis in Corozal, Puerto Rico. J Parasitol. 1982;68(2):297-299. DOI
  30. Derrick, E. and Darley, C. Contact dermatitis to nasturtium. Br.J Dermatol 1997;136(2):290-291. PubMed
  31. Narain, K., Biswas, D., Rajguru, S. K., and Mahanta, J. Human distomatosis due to Fasciola hepatica infection in Assam, India. J Commun.Dis 1997;29(2):161-165.
  32. Brinker, F. Herb Contraindications and Drug Interactions. 1998;2nd edition.
  33. Gruenwald, J. PDR for Herbal Medicines. 1998;1st ed.
  34. Clemente M, Miguel MD, Felipe KB, et al. Effect of watercress extract supplementation on lipid profile and oxidative stress markers in overweight people with physical disability: A randomized, double-blind, and placebo-controlled trial. Phytother Res. 202 PubMed

See these in context on the Watercress monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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