Frozen blackberries are harvested ripe and frozen soon after picking, helping preserve their fiber, vitamins, minerals, and protective plant compounds. Like fresh blackberries, they are particularly rich in fiber and provide anthocyanins, ellagitannins, ellagic acid, and other polyphenols that support gut health, healthy inflammatory and antioxidant signaling, vascular function, and cellular protection. Freezing makes this deeply pigmented, nutrient-dense berry available year-round. Their sweet-tart flavor works especially well in smoothies, oatmeal, yogurt, baked goods, sauces, fruit compotes, and desserts.