As an herbal raw material, it is an excellent source of vitamins, minerals, and other valuable components for health, a study conducted by scientists at William Peterson University has proven.

An excerpt from the article 20 facts about watercress

Among the minerals are potassium, calcium, magnesium, zinc, manganese, iron, phosphorus, sodium, copper, and selenium. It contains a lot of vitamins: K, A, C, E, and B (B3, B6, B2, B1). It is richer in vitamin C than an orange, has more vitamin E than broccoli, contains more iron than spinach, is a richer source of calcium than milk, as well as contains more beta-carotene than carrots or more potassium than tomatoes. It also contains lutein and zeaxanthin, as well as flavonoids.