Orange juice is not high in oxalates. A standard cup of orange juice contains roughly 1 to 2 milligrams of oxalate, placing it firmly in the “very low” category. For context, a low-oxalate diet for kidney stone prevention typically caps intake at around 100 milligrams per day, so even a few glasses of orange juice barely registers.
How Orange Juice Compares to Other Drinks
Among citrus juices, oxalate levels are uniformly low. A 6-ounce glass of orange juice (from concentrate or chilled) contains about 1.1 milligrams of oxalate. Grapefruit juice comes in at 2.2 milligrams per 6-ounce serving, and a tablespoon of raw lemon juice has under 1 milligram. None of these come close to high-oxalate beverages like certain black teas, hot chocolate, or some plant-based milks, which can deliver 10 to 30 milligrams or more per serving.
For comparison, a half-cup of cooked spinach can contain over 750 milligrams of oxalate. Rhubarb, beets, and almonds are other well-known high-oxalate foods. Orange juice is in an entirely different league.
The Kidney Stone Complication
Here’s where it gets more nuanced. Even though orange juice itself is low in oxalate, a study comparing it to potassium citrate (a medication commonly prescribed for kidney stones) found that drinking orange juice slightly increased urinary oxalate levels. This likely has less to do with the oxalate in the juice and more to do with its vitamin C content.
Your body breaks down vitamin C (ascorbic acid) as part of normal metabolism, and one of the byproducts is oxalate. Research using isotope tracking has estimated that this breakdown can account for more than 40% of the oxalate found in urine. A single cup of orange juice delivers about 120 milligrams of vitamin C, so the indirect contribution matters more than the tiny amount of oxalate in the juice itself.
That said, the increase in urinary oxalate from moderate orange juice consumption is modest. For most people, it’s not clinically meaningful. But if you’re a recurrent calcium oxalate stone former and your urologist has flagged high urinary oxalate as a specific risk factor, this is worth knowing.
Orange Juice May Still Help Prevent Stones
The picture isn’t all caution. Orange juice is rich in citrate, a natural compound that inhibits kidney stone formation. In the same study, orange juice raised urinary citrate from 571 to 952 milligrams per day, nearly matching the effect of potassium citrate medication (which raised it to 944 milligrams per day). Citrate works by binding to calcium in urine, making it less available to combine with oxalate and form crystals.
Orange juice also makes urine more alkaline. Despite being acidic in the glass (pH around 3.6), it produces an alkaline effect once metabolized, raising urinary pH significantly. Higher urinary pH helps dissolve uric acid and reduces the formation of certain types of stones.
The catch is that while potassium citrate medication both increases citrate and decreases urinary calcium, orange juice only does the first part. It raises citrate but doesn’t lower calcium, and it adds a small amount of oxalate through vitamin C metabolism. So orange juice provides a real protective benefit, but it’s not a perfect substitute for prescribed citrate therapy in people who need it.
Practical Takeaways for Stone Formers
If you’re watching your oxalate intake, orange juice is one of the safer beverage choices. The oxalate it contains directly is negligible. The more relevant consideration is the vitamin C it delivers, which your body partially converts to oxalate. For someone drinking a glass or two a day, this is a minor factor. For someone consuming large volumes or also taking vitamin C supplements, the cumulative effect on urinary oxalate could become significant.
The citrate and alkalinizing benefits of orange juice work in your favor for stone prevention. If you enjoy it and aren’t dealing with other concerns like blood sugar management, moderate consumption fits comfortably within a low-oxalate diet. Focusing your oxalate reduction efforts on the truly high-oxalate foods, like spinach, rhubarb, nuts, and certain beans, will make a far bigger difference than worrying about your morning glass of orange juice.