Is Soymilk Safe for Kidney Stones? (Safe)
mg oxalate
per serving
Serving: 1/2 cup, sliced (62 g)
Verdict: 🟢 Safe
Per 100g: 9 mg
Data: Harvard T.H. Chan SPH (2024)
What this means: Soymilk is rated Safe (🟢). At 5 mg oxalate per serving, it's well under the 25 mg safety threshold. You can include it regularly in a kidney stone diet. Pair it with calcium-rich foods (dairy, fortified plant milks) for additional protection, and drink plenty of water throughout the day.
Among dairy & eggs, Soymilk sits well above 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 Soymilk is 50% above the category norm. Within its specific category, Soymilk ranks on the higher end for oxalate. 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 line is the reference point clinicians use to separate everyday foods from ones that need caution. Every value on this page traces back to Harvard's 2024 lab analysis, so the threshold is applied to measured data rather than estimates. Applied to Soymilk: 5 mg oxalate per 1/2 cup, sliced — Safe per Harvard (2024).
Can I eat this food every day?
For Safe foods (under 25 mg/serving), daily use is generally fine. Caution and Avoid foods work better as occasional items — rotate them with safer options so no single high-oxalate food becomes a habit. Soymilk comes in at 5 mg oxalate per 1/2 cup, sliced (Safe) in the measured database.
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. Soymilk comes in at 5 mg oxalate per 1/2 cup, sliced (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 Soymilk: 5 mg oxalate per 1/2 cup, sliced — Safe per Harvard (2024).