Like other berries, cranberries are antioxidant powerhouses. In fact, when it comes to fruit, they rank just under blueberries (often called the king of antioxidants) in antioxidant potency. Cranberries also provide anti-inflammatory compounds. Research shows that people who consume cranberries have lower levels of C-reactive protein, a blood marker of inflammation, which is a known trigger of premature aging, chronic illness, and cognitive decline.The vitamin C in cranberries supports immunity and is required to make collagen, so it plays a key role in skin and joint health and overall healing.