Antioxidants found in spinach are extremely hydrating and aid in oxygenating and refuelling the entire body. It also contains plenty of magnesium, plant-based heme iron, lutein, and vitamins A, C, E, and K. The high vitamin C content of this adaptable leafy green promotes the production of collagen to keep skin smooth and firm. While vitamin K has been demonstrated to help reduce inflammation in cells, vitamin A may help promote healthy, shiny hair.