Butter is rich in vitamins A, E, K and D, as well as trace minerals such as selenium (a powerful antioxidant). Butter also has appreciable amounts of butyric acid (known to be an anticarcinogen). And yes, butter is a source of cholesterol, which is needed to maintain intestinal health as well as for brain and nerve development in the young.
Non-organic butter was ranked as the food most contaminated with dangerous toxic chemicals. Organic butter is free of the potentially dangerous pesticides, antibiotics and growth hormones.