The standout vitamin in orange juice is vitamin C. A single 8-ounce glass of 100% orange juice delivers roughly 84 milligrams of it, which covers most adults’ entire daily need (the recommended intake is 75 mg for women and 90 mg for men). But vitamin C isn’t the only nutrient worth knowing about. Orange juice also contains folate, thiamine, and potassium, and many commercial brands are fortified with calcium and vitamin D.
Vitamin C: The Headline Nutrient
Vitamin C is the reason orange juice has its health reputation. That 84 mg per cup fuels several important functions: it helps your body build collagen for skin and wound repair, supports your immune system’s ability to fight infections, and acts as an antioxidant that protects cells from damage. It also improves your absorption of iron from plant-based foods like spinach and beans, which is why pairing a glass of OJ with an iron-rich meal can make a real difference if you’re prone to low iron levels.
One thing that surprises many people is that your body absorbs vitamin C from orange juice just as efficiently as from a supplement pill. Research comparing blood levels of vitamin C after people consumed orange juice, orange slices, cooked broccoli, and synthetic vitamin C tablets found no meaningful difference in absorption. Natural and synthetic vitamin C are chemically identical, so there’s no special advantage to getting it from juice versus a supplement, or vice versa. The advantage of juice is simply that most people enjoy drinking it more than swallowing a tablet.
Other Vitamins and Minerals in Orange Juice
Beyond vitamin C, orange juice provides a handful of B vitamins. Thiamine (vitamin B1) helps your body convert food into energy and supports nerve function. Folate (vitamin B9) is essential for cell division and DNA formation, making it especially important during pregnancy. An 8-ounce glass contains a small amount of each, contributing to your daily intake without covering it entirely.
Potassium is the most notable mineral in orange juice, with about 105 mg per serving. Potassium helps regulate blood pressure and supports normal muscle and nerve function. While that amount is modest compared to the roughly 2,600 to 3,400 mg most adults need daily, it adds up alongside other potassium-rich foods like bananas, potatoes, and beans.
What Fortified Orange Juice Adds
Many commercial orange juice brands go beyond what’s naturally present in the fruit. The most common additions are calcium and vitamin D, two nutrients that work together to maintain bone strength. Major brands typically add about 350 mg of calcium and 100 international units of vitamin D per 8-ounce serving. That calcium content is comparable to what you’d get from a glass of milk, making fortified OJ a practical alternative for people who are lactose intolerant or don’t consume dairy.
If you’re buying orange juice partly for these added nutrients, check the label. Not all brands fortify, and the amounts can vary. The words “with added calcium and vitamin D” will appear on the front of the carton if they’ve been included.
How Processing Affects Vitamin Content
Fresh-squeezed orange juice retains the most vitamin C, but most of what you’ll find in a grocery store has been pasteurized (heated to kill harmful bacteria). Pasteurization does reduce vitamin C content to some degree. Studies on fruit juices show losses that can reach 27% or more depending on the duration and temperature of heating. Storage time matters too: the longer juice sits on the shelf or in your fridge after opening, the more vitamin C breaks down through exposure to air and light.
To get the most vitamin C from store-bought juice, choose cartons with the furthest-out expiration date and drink them within a week of opening. Juice sold in opaque containers also preserves vitamin C better than clear bottles, since light accelerates the breakdown.
Balancing Vitamins Against Sugar
Orange juice is nutrient-dense, but it comes with a tradeoff: a single 8-ounce glass contains about 23 grams of natural sugar. That’s close to the American Heart Association’s recommended daily sugar limit of 25 grams for women and not far from the 36-gram limit for men. Unlike eating a whole orange, drinking juice removes most of the fiber that slows sugar absorption, so the sugar hits your bloodstream faster.
This doesn’t mean orange juice is unhealthy. Only about 12% of U.S. adults eat the recommended amount of fruit each day, and juice is an easy way to close that gap. The key is portion size. One glass per day gives you a strong dose of vitamin C and other nutrients without pushing your sugar intake over the edge. Pouring a second or third glass is where the balance tips toward too much sugar for too little additional benefit. If you regularly drink more than one serving, consider eating a whole orange instead for some of those servings, since you’ll get the same vitamins plus the fiber that juice leaves behind.