The phrase "frozen concentrate" means a liquid that has been frozen to make it smaller and more convenient to store, and you can add water to it to make it drinkable or usable again. Full definition
While orange juice frozen concentrate offers some advantages, such as a long shelf life and easy storage, it provides less nutritional value than fresh orange juice. (healthyeating.sfgate.com)
A cup of fresh orange juice contains 124 milligrams of vitamin C, while an equivalent serving of juice made from frozen concentrate contains 97 milligrams. (healthyeating.sfgate.com)
A 1 - cup serving of orange juice made fresh or from frozen concentrate contains 112 calories, or approximately 6 percent of the daily calorie intake based on a 2,000 - calorie diet. (healthyeating.sfgate.com)