Watercress
Watercress is a peppery, nutrient-dense leafy green vegetable rich in vitamin K, vitamin C, and glucosinolates. It is commonly consumed raw in salads or cooked as a side dish.
Also known as: Nasturtium officinale, garden watercress
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Watercress is a fast-growing aquatic or semi-aquatic plant native to Europe and western Asia, belonging to the Brassicaceae (cruciferous) family. It thrives in cool, moving water and is now cultivated commercially in the United States, Europe, and Asia. The plant is harvested for its tender, peppery leaves and young stems, which are used fresh in salads, sandwiches, soups, and as a cooked green. It has been consumed for centuries in traditional European and Asian cuisines.
Watercress is low in calories (approximately 11 calories per 34 g serving) and an excellent source of vitamin K, as well as a good source of vitamin C and folate. It contains bioactive compounds including glucosinolates—sulfur-containing molecules characteristic of cruciferous vegetables—which are primarily broken down by the plant enzyme myrosinase upon chewing and also by gut microbiota, yielding compounds such as isothiocyanates. The plant also provides calcium, manganese, and small amounts of omega-3 fatty acids.
Vitamin K and Blood Clotting
Watercress is a rich source of vitamin K, providing a substantial portion of the daily adequate intake in a single serving. Vitamin K is essential for the synthesis of clotting factors and bone mineralization. Individuals taking warfarin or other vitamin K-dependent anticoagulants should maintain consistent intake of watercress and similar high-vitamin-K greens rather than avoid them, as sudden increases or decreases can interfere with medication efficacy. Consultation with a healthcare provider or anticoagulation clinic is recommended for those on these medications.
Safety and Consumption
Watercress is well tolerated by most people when consumed in typical salad or cooked portions (1–2 cups per serving). Raw watercress should be sourced from reputable suppliers and thoroughly washed, as the plant grows in water and may harbour bacteria such as Escherichia coli or Cryptosporidium if sourced from untreated or contaminated water. Individuals with compromised immune systems and pregnant women should verify the source or cook watercress before consumption. Oxalate content in watercress is low, making it generally acceptable for those managing kidney health, though individuals with kidney disease should confirm appropriate intake with their healthcare provider.
Frequently Asked Questions
Is watercress safe to eat raw?
Raw watercress is safe when sourced from reputable suppliers with clean water sources and properly washed. However, watercress grown in untreated or stagnant water may carry pathogens such as E. coli or Cryptosporidium. Pregnant women, young children, and immunocompromised individuals should cook watercress before eating to eliminate potential pathogens.
Can I eat watercress if I take warfarin?
Yes, but consistency matters. Watercress is a rich source of vitamin K, and sudden large changes in intake can affect how well warfarin works. Maintain steady consumption and let your anticoagulation clinic know about your typical dietary intake of high-vitamin-K foods, including watercress.
How much watercress should I eat?
Standard serving sizes are 1–2 cups of fresh watercress per meal. There is no established upper limit for healthy adults, and watercress is low in oxalates and other compounds that typically require portion restriction. Those with kidney disease or who take anticoagulant medication should confirm appropriate intake with their healthcare provider.
Sources
- Watercress — Nutrition Data — USDA FoodData Central
- Vitamin K: Dietary Supplement Fact Sheet — NIH Office of Dietary Supplements
- Food Safety and Produce Safety — CDC
Educational content: This page is for general informational purposes only. Individual responses to foods vary widely. If you suspect a food allergy or sensitivity, consult a licensed dietitian, allergist, or physician before making dietary changes. Full disclaimer
Some content on this site is AI-assisted. While we strive for accuracy, information may not reflect the latest research. Always verify health information with a professional.
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