Spend 60-70% of your time cycling (i.e. for every 10 hours training cycle 7 hours run 2 hours and swim 1 hour) This is only a very basic guide line for injury prevention and you will get some cross over in fitness, the better you are on a bike your ironman marathon will be easier to complete.
People with liver disease and high alcohol intake may be at risk for liver toxicity from vitamin A supplementation. Vitamin A toxicity may lead to intrahepatic cholestasis, where bile cannot flow from the liver into the intestines. Vitamin A may cause low blood pressure. Caution is advised in people with low blood pressure or in those taking drugs or herbs and supplements that lower blood pressure.
Vitamin D is responsible for proper absorption of calcium, so you need lots of this vitamin every day for optimal bone strength. Vitamin D-3 is the form found in many supplements and most foods that are rich in vitamin D, and it's the kind your body makes when you get sun exposure. Although D-3 is beneficial, too much can lead to toxic effects.