Leeks belong to the allium family, alongside garlic and onion. People eat the vegetable more often than they take it as a supplement.
The vegetable supplies fiber and prebiotic compounds that aid digestion and gut health. Flavonoid antioxidants are present too. Most cooks use leeks in soups or as a side dish. As a supplement, dried leek powder comes in capsules taken with meals.
Eating leeks is safe. Supplemental forms contain vitamin K and may interact with blood-thinning medications.