It's most important to only eat liver from properly cared for animals. More so than steak, improperly cared for animals retain toxins from drugs, chemicals, antibiotics and hormones in the liver. Rest assured with Country Certified Carter Country Meats liver . Liver is a great source of high quality protein and is one of the most concentrated sources of vitamin A, along with copper, folic acid and iron. It also contains Coenzyme Q10 (CoQ10), which is important for cardiovascular functions. Athletes love liver because it improves the oxygen-carrying capacity of blood cells, increasing endurance and strength and fighting fatigue, while its B vitamins aid people with Alzheimer’s and other forms of dementia. Liver Soaking in lemon juice or milk for several hours before cooking reduces liver’s strong metallic taste. Sear it until it’s light pink and top with caramelized onions. Cooking too long can make liver tough or rubbery, and releases many of the nutrients and digestive enzymes.