How Much Oxalate Is in Grape juice?
mg oxalate
per serving
Serving: 1 cup (253 g)
Verdict: 🟢 Safe
Per 100g: 0.4 mg
Data: Harvard T.H. Chan SPH (2024)
The bottom line for Grape juice: Safe (🟢), with 1 mg oxalate per serving — comfortably below the 25 mg safe cutoff. There's no need to limit it. Just keep your usual kidney stone basics in place: water throughout the day and calcium-rich foods at meals.
Putting Grape juice in context: it lands well below the category average of 40 mg. In the database, 89% of beverages (82 of 92) fall in the 🟢 Safe group (under 25 mg oxalate/serving). The typical beverages here averages 40 mg oxalate per serving, so Grape juice runs 98% below that baseline. That places it among the lower-oxalate options in its category. Why this matters: the gap between two Safe foods can be wide — one may hold 5 mg oxalate while another sits at 24 mg. The lower one leaves more room in your day. See all beverages rated Safe for a full side-by-side.
Why does oxalate per 100g matter?
Per-100g values put every food on the same scale, which is handy when serving sizes differ a lot between foods — or when your portion doesn't match the standard serving. It lets you compare apples to apples on oxalate density. Applied to Grape juice: 1 mg oxalate per 1 cup — Safe per Harvard (2024).
How accurate is the oxalate measurement?
Harvard's 2024 analysis used ion chromatography — the gold standard for oxalate measurement. These are direct lab values, not estimates or database calculations. Variability exists between samples, but this is the most reliable reference available. For Grape juice, the measured oxalate value is 1 mg per 1 cup (Safe).
How does this compare to other foods?
Anything under 25 mg per serving is Safe; 25-99 mg is Caution; 100 mg or more is Avoid. The category pages on OxalateWatch list foods side by side, so you can see where this one ranks. Grape juice comes in at 1 mg oxalate per 1 cup (Safe) in the measured database.