Can one give too much vitamin?

Can one give too many vitamins? Most vitamins are water soluble. If the intake is too high, the excess is excreted naturally through the urine — these vitamins are therefore safe and not harmful. However, some vitamins are fat soluble: A, D, E and K. These are stored in the liver. If given in large quantities for long periods of time, the liver becomes saturated and damage can occur. Too much vitamin D can cause calcium problems in the bones. The levels in feed that we normally purchase are usually good. But if you add extra yourself, problems can arise.