V8 vegetable juice contains water and the concentrated juice of tomatoes, carrots, celery, beets, parsley, lettuce, watercress and spinach as well as salt, vitamin C, natural flavoring and citric acid. The natural flavoring is a trade secret, but the V8 brand assures its customers that they come from natural sources, are compliant with the FDA rules and do not contain MSG or any of the eight major food allergens.
Some vegetarians and vegans have expressed concern that the natural flavoring might include animal products. As of 2015, the company has not confirmed this, but it is possible. The U.S. Code of Federal Regulations states that natural flavoring can consist of meat, seafood, poultry and other animal products as long as they are used for flavoring and not nutritional purposes.
A serving of 8 ounces of V8 juice contains the equivalent of 1 cup of vegetables. This is more than one third of the 2 1/2 cups of vegetables that Dietary Guidelines recommend as part of a 2,000 calorie diet. It provides more than 100 percent of the daily recommended allowance for vitamin C and various amounts of other vitamins and minerals. It also has 27 percent of the daily recommended allowance for sodium.