If you are on a low carb diet, it is advisable to take supplements to keep you healthy. Since you are depriving yourself with essential vitamins and minerals, you should take multivitamins everyday. Since you mainly eat animal-based protein, it is also advisable that you get supplemental digestive enzymes to maximize the breakdown and digestion of nutrients. You should also take phytosterols to minimize the absorption of cholesterol and panthethine can help reduce the production of cholesterol in the body. Choose supplements that contain both of these supplements to improve the reduction of cholesterol. Fish oil is also important as it improves your cholesterol level. Other nutrients that should be included are B12, calcium, iodine, potassium, manganese, zinc and copper.