Blue Ice Royal Blend products combine the best of both worlds - land and sea: X-Factor Gold Butter Oil and Blue Ice Fermented Cod Liver Oil. They're a great source of vitamins A, D and K-2, which is often said to be the "X-Factor" that Dr. Weston Price wrote about in his groundbreaking book "Nutrition and Physical Deterioration" which focuses on the link between health and diet. Natural Health Advocates is pleased to offer these products for sale in your choice of gel or capsule form. Enjoy in good health!