How Much Oxalate Is in Soy?
mg oxalate
per serving
Serving: (30 g)
Verdict: 🟢 Safe
Per 100g: 16.7 mg
Data: Harvard T.H. Chan SPH (2024)
In practical terms, Soy 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 legumes, Soy sits well below the category average of 20 mg. For context, 44 out of 60 legumes (73%) are rated 🟢 Safe (under 25 mg oxalate/serving). The average legumes in our database has 20 mg oxalate per serving — which means Soy is 75% below the category norm. Within its specific category, Soy 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 legumes 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. Soy comes in at 5 mg oxalate per (Safe) in the measured database.
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 Soy, the measured oxalate value is 5 mg per (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. For Soy, the measured oxalate value is 5 mg per (Safe).