Health benefits of black currant seed oil to help their blood flow, immune system, eye health, gut health and kidney health. Blackcurrants contain many vitamins such as: A, B-5, B-6, B-1, and E. Significant is vitamin C. Black currants carry 4 times the vitamin C as oranges. Twice the antioxidants of blueberries. The benefits of vitamin C: Vitamin C is used to metabolize protein and form collagen.