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 E and Vitamin K. Vitamin E and vitamin K are fat-soluble vitamins, which means they're stored in the body. Over-consumption of vitamin E may lead to toxicity, so you shouldn't have more than 1,000 milligrams a day. Vitamin K toxicity is rare and an upper intake hasn't been established.