Collards belong to the Brassica family alongside kale and cabbage. People eat these leafy greens as a whole food, not an isolated supplement. They provide fiber for digestion, potassium and antioxidants for heart health, and vitamins C and A for immune function.
A typical intake is about 1 cup cooked. They work well steamed, sautéed, in soups, or blended into smoothies. Fat, like a drizzle of olive oil, helps the body absorb the fat-soluble vitamins A, K, and E.
Anyone on blood thinners such as warfarin should keep collard intake steady because of the high vitamin K content. Reduce portions if you have oxalate-sensitive kidney concerns.