It turns out that weeds are beneficial - dandelion is used as a traditional medicine around the globe. From China to Mexico, and from Russia to India, people have used dandelion for its potential diuretic, liver-protecting, and anti-hyperglycemic effects. Dandelion leaves are particularly rich in calcium and Vitamin K. They also contain chlorogenic acid, a compound that's been studied for its potential antioxidant effects. Researchers are also investigating how dandelion may support healthy blood sugar, potentially through slowing the digestion of carbohydrates.