Watercress, a leafy green from the Brassicaceae family—alongside kale, cabbage, and Brussels sprouts—is a nutrient-packed vegetable known for its peppery, slightly spicy taste.

Once considered a weed, it’s now cultivated globally and recognized for a wide array of health benefits, from boosting immunity to supporting bone health.

10 Incredible Health Benefits of Watercress

1. Rich in Essential Nutrients

Despite its low calorie count, watercress is loaded with vital nutrients. Just one cup (34 grams) delivers over 100% of the recommended daily intake (RDI) for vitamin K, along with generous amounts of vitamins A and C.

It also contains calcium, manganese, and small quantities of several other vitamins and minerals. This nutritional density earned it the top spot on the US CDC’s Powerhouse Fruits and Vegetables list.

2. High Antioxidant Content May Help Prevent Disease

Watercress is rich in antioxidants—compounds that fight oxidative stress and cell damage caused by free radicals. This protective property may lower the risk of chronic conditions such as heart disease, cancer, and diabetes.

One study analyzing 12 cruciferous vegetables found watercress had the highest total phenolic content and strongest ability to neutralize free radicals.

3. Natural Compounds with Cancer-Fighting Potential

Like many cruciferous vegetables, watercress contains glucosinolates, which are converted into isothiocyanates such as sulforaphane and PEITC during chewing or chopping.

These compounds are believed to protect healthy cells, deactivate carcinogens, and slow tumor growth. Studies have shown that isothiocyanates from watercress may inhibit cancers of the colon, lung, prostate, skin, and breast.

4. Supports Heart Health

Watercress promotes cardiovascular well-being in several ways. Diets high in cruciferous vegetables are associated with a reduced risk of heart disease. Its antioxidants—beta carotene, lutein, and zeaxanthin—may lower blood pressure and prevent artery damage.

Watercress is also a source of dietary nitrates, which improve blood vessel function and may reduce cholesterol levels, as shown in a study where rats treated with watercress extract had significantly lower total and LDL cholesterol.