5. Vitamin K
Kale is one of the best sources of vitamin K on the planet. Vitamin K is an essential nutrient for human health. It is absolutely necessary for blood clotting, and it accomplishes this by “activating” specific proteins and allowing them to bind calcium.
The form of vitamin K in kale is K1, which is different than vitamin K2. K2 is found in fermented soy foods and certain animal products. It helps prevent heart disease and osteoporosis.