How can you conserve the vitamins in Milk?

When milk is heated and then again cooled and kept in refrigerator for 2-3 days and then heated again, it looses 50% of its vitamins. So this should be avoided.
Also milk should not be kept in warm conditions for too long as at such temperatures vitamin killing enzymes are produced.

We should reduce the surface area of the container in which we keep or heat milk.