Thank you FF. Dr. Price discovered the "Activator X" which is a catalyst which helps the body absorb and utilize minerals. He recommended butter oil ("from cows eating rapidly growing grass in the spring and fall seasons") combined with cod liver oil as being more effective than CLO alone. Activator X is apparently not destroyed by pasteuization and is also found in organ meats from grazing animals and some seafood. Butter can be especialy rich source. "It disappears in cows fed cottonseed meal, high protein soy-based feeds or even hay".