There are no secondary nutritional vitamins or minerals in the oil, neither added or removed. Apart from a trace amount (0.5%) tocopherol as a preserving agent, the oil in the softgel is pure algae oil. The softgels are made of cornstarch, carrageenan, vegetable glycerine and purified water. The carrageen ingredient in the softgel capsule is highly refined and contains no iodine.