How Much Oxalate Is in corn?
mg oxalate
per serving
Serving: 1 tortilla (24 g)
Verdict: 🟢 Safe
Per 100g: 4.2 mg
Data: Harvard T.H. Chan SPH (2024)
In practical terms, corn is a low-risk food for kidney stone patients. Its 1 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 grains & pasta, corn sits well below the category average of 14 mg. For context, 170 out of 201 grains & pasta (84%) are rated 🟢 Safe (under 25 mg oxalate/serving). The average grains & pasta in our database has 14 mg oxalate per serving — which means corn is 93% below the category norm. Within its specific category, corn 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 grains & pasta rated Safe to compare within the same verdict level.
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. For context, corn measures 1 mg per 1 tortilla, rated Safe.
How accurate is the oxalate measurement?
These values come from Harvard's 2024 ion-chromatography analysis — the gold-standard method for oxalate. Real measured data rather than estimates. Sample-to-sample variation exists, but no published source is more dependable for food oxalate. corn comes in at 1 mg oxalate per 1 tortilla (Safe) in the measured database.
How does this compare to other foods?
Foods under 25 mg per serving are rated Safe. Foods between 25-99 mg are Caution. 100+ mg is Avoid. Check the food's category page on OxalateWatch to see how it compares to similar foods. For context, corn measures 1 mg per 1 tortilla, rated Safe.