Holland & Barrett's Pure Cod Liver Oil Gelatine-Free capsules are high in essential omega-3 fatty acids and are also an excellent source of Vitamins A and D. Both Vitamins A and D contribute to normal immune system function. Vitamin A also contributes to the maintenance of normal skin, whilst Vitamin D contributes to the maintenance of normal bones and muscle function. Holland & Barrett's Pure Cod Liver Oil Gelatine-Free capsules are high in essential omega-3 fatty acids and are also an excellent source of Vitamins A and D. Both Vitamins A and D contribute to normal immune system function. Vitamin A also contributes to the maintenance of normal skin, whilst Vitamin D contributes to the maintenance of normal bones and muscle function.