Is Soy milk (Unsweetened) Safe for Kidney Stones? (Safe)
mg oxalate
per serving
Serving: 1 cup (243 g)
Verdict: 🟢 Safe
Per 100g: 0.8 mg
Data: Harvard T.H. Chan SPH (2024)
In practical terms, Soy milk (Unsweetened) is a low-risk food for kidney stone patients. Its 2 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 dairy & eggs, Soy milk (Unsweetened) sits below the category average of 3 mg. For context, 87 out of 91 dairy & eggs (95%) are rated 🟢 Safe (under 25 mg oxalate/serving). The average dairy & eggs in our database has 3 mg oxalate per serving — which means Soy milk (Unsweetened) is 40% below the category norm. Within its specific category, Soy milk (Unsweetened) 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 dairy & eggs rated Safe to compare within the same verdict level.
Why does the safe threshold matter?
The 25 mg per serving threshold is based on clinical guidance for kidney stone patients. Harvard's lab data (2024) provides the most reliable oxalate measurements available — no database estimates, direct lab analysis. For Soy milk (Unsweetened), the measured oxalate value is 2 mg per 1 cup (Safe).
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 context, Soy milk (Unsweetened) measures 2 mg per 1 cup, rated Safe.
Where does the oxalate data come from?
Harvard T.H. Chan School of Public Health (2024) via the OHF database. These are direct laboratory measurements — the most reliable oxalate data available for food. Soy milk (Unsweetened) comes in at 2 mg oxalate per 1 cup (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. Soy milk (Unsweetened) comes in at 2 mg oxalate per 1 cup (Safe) in the measured database.