Green smoothie veggie is a term used to describe a smoothie made with green vegetables, such as KALE. KALE is a leafy green vegetable that is high in vitamins and minerals, and is often used in green smoothies. It is a cruciferous vegetable, meaning it belongs to the same family as broccoli, cauliflower, and Brussels sprouts. KALE is a popular choice for green smoothies because of its mild flavor and nutrient-dense profile.