Is Mustard Greens Safe for Kidney Stones? (Safe)
mg oxalate
per serving
Serving: 1/2 cup, chopped (70 g)
Verdict: 🟢 Safe
Per 100g: 7 mg
Data: Harvard T.H. Chan SPH (2024)
In practical terms, Mustard Greens is a low-risk food for kidney stone patients. Its 5 mg oxalate per serving stays under the 25 mg line, so it can appear in your regular rotation without extra calculation. As always, staying hydrated and getting dietary calcium supports stone prevention.
Among vegetables, Mustard Greens sits well below the category average of 27 mg. For context, 219 out of 271 vegetables (80%) are rated 🟢 Safe (under 25 mg oxalate/serving). The average vegetables in our database has 27 mg oxalate per serving — which means Mustard Greens is 82% below the category norm. Within its specific category, Mustard Greens ranks among the lower-oxalate options. This context matters because two 'Safe' foods can have very different oxalate levels — one might have 5 mg while another has 24 mg. Both are Safe, but the first gives you more dietary flexibility. Browse all vegetables rated Safe to compare within the same verdict level.
Why does the safe threshold matter?
The 25 mg cutoff comes from clinical guidance for stone formers. Below it, a food's oxalate contribution is small enough not to move the needle for most patients. Harvard's 2024 lab data sits behind these figures — direct measurements, not estimates. Applied to Mustard Greens: 5 mg oxalate per 1/2 cup, chopped — Safe per Harvard (2024).
Can I eat this food every day?
Daily eating is fine for Safe foods (under 25 mg/serving). For Caution or Avoid foods, spread them out and alternate with low-oxalate picks. The idea is keeping your weekly oxalate load manageable, not eliminating any single food. For Mustard Greens, the measured oxalate value is 5 mg per 1/2 cup, chopped (Safe).
Where does the oxalate data come from?
Every oxalate figure is sourced from Harvard T.H. Chan SPH (2024), distributed via the OHF database. The values come from actual lab measurements of the foods — not from database averages or estimates. Mustard Greens comes in at 5 mg oxalate per 1/2 cup, chopped (Safe) in the measured database.
Should I also check sodium and calcium?
Yes — kidney stone risk isn't just about oxalate. High sodium increases urinary calcium (a stone promoter). Adequate dietary calcium (from food, not supplements) actually binds oxalate in your gut. Check the food's full nutrition page for the complete picture. Applied to Mustard Greens: 5 mg oxalate per 1/2 cup, chopped — Safe per Harvard (2024).