Dehydrated bodies do not function as well. IV hydration therapy is a way of getting the vitamins, minerals, antioxidants, and even medications they need to feel better and keep the body functioning properly. IV therapy is administered through an infusion, sometimes a drip, or an injection using a syringe.it is the quickest way to get drugs, blood products, and vitamins into the bloodstream. With IV therapy nutrients enter directly into the bloodstream bypassing the digestive system and increasing absorbents in the body.