Blackberries FZBlackberries are sweet, juicy berries with a deep purple black color and a slightly tart flavor. They are rich in vitamins, fiber, and antioxidants, making them perfect for smoothies, jams, desserts, or simply enjoying fresh. Allergen Information: Naturally free from common allergens such as gluten, dairy, and soy. However, it may be processed in facilities that handle allergens like nuts and shellfish, so cross contamination is possible.