Vitamin C: They are a good source of vitamin C, which boosts the immune system, promotes skin health, and aids in wound healing Fiber: Blackberries are high in dietary fiber, which supports digestive health, prevents constipation, and may lower cholesterol levels Vitamin K: They contain vitamin K, important for bone health and blood clotting Anthocyanins: The dark color of blackberries comes from anthocyanins, which have anti-inflammatory properties and may contribute to heart health.