Black currants have been shown to have twice the potassium of bananas, four times the vitamin C of oranges, and twice the antioxidants of blueberries. Black currants also contain anthocyanins. Anthocyanins inhibit the enzymes cyclooxygenase 1 and 2, and help reduce inflammation and the effects of arthritis in the body. The effect is similar to aspirin or ibuprofen, and is considered by many as an effective natural alternative.
Black currants are also very rich in many phytonutrients, antioxidants, vitamins, essential fatty acids and minerals. In particular, they are renowned for their high content in Vitamin C (a powerful antioxidant), GLA (Gamma--Linoleic Acid, a very rare Omega-6 essential fatty acid) and potassium.
The fruit juice of black currant contains proanthocyanidins, anthocyanins and a polysaccharide-rich substance called cassis polysaccharide (CAPS). CAPS was found to consist of mannose, galactose, xylose, rhamnose, xylose, arabinose and glucose. This substance has been proven to be very toxic against tumor cells which has prompted additional studies to determine the anti-cancer properties of black currants. In addition, black currant seed oil contains 47% linoleic, 14% alpha-linolenic, 12% gamma-linolenic, and 2.7% stearidonic acids. Of these, gamma-linoleic is rarely found in any other natural resource, and both alpha and gamma-linoleic are essential fatty acids.