The health value of orange juice is debatable: it has a high concentration of vitamin C, but also a very high concentration of simple sugars, comparable to soft drinks. It is wonderful in cocktails, though, with its sweetness perfectly balancing the liquor or bitterness of other ingredients.
Commercial orange juice with a long shelf life is made by pasteurizing the juice and removing the oxygen from it. This removes much of the taste, necessitating the later addition of a flavor pack, generally made from orange products. So we at Cocktail Builder advise making your own “OJ” from fresh oranges.