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Is Soy Milk Safe for Kidney Stones? (Caution)

It depends on your situation. Soy Milk has 28 mg oxalate per 1 cup — in the caution zone (25-99 mg). It's not off-limits, but portions matter. If you're tracking oxalate closely, eat smaller amounts or pair it with calcium-rich foods.
✓ Lab-Verified Data Based on Harvard T.H. Chan SPH oxalate data (2024) and NKF/AUA dietary guidelines.
28
mg oxalate
per serving
Food: Milk, plant-based, Soy, Chocolate flavor, Silk
Serving: 1 cup (242 g)
Verdict: 🟡 Caution
Per 100g: 12 mg
Data: Harvard T.H. Chan SPH (2024)
🔄 Lower-Oxalate Alternatives
🟢 Cottage Cheese Milk Products
0 mg / serving
🟢 Ice Cream Milk Products
0 mg / serving
🟢 Kefir Milk Products
0 mg / serving
🟢 Sour Cream Milk Products
0 mg / serving
💡 What This Means for Your Diet

Here's the takeaway: Soy Milk falls in the Caution band (🟡) at 28 mg oxalate per serving. Not off-limits, but not free — moderate portions, a few times a week at most, and preferably with dairy or another calcium source at the same meal.

📊 Soy Milk vs. Other Dairy & Eggs

Putting Soy Milk in context: it lands well above the category average of 3 mg. In the database, 95% of dairy & eggs (87 of 91) fall in the 🟢 Safe group (under 25 mg oxalate/serving). The typical dairy & eggs here averages 3 mg oxalate per serving, so Soy Milk runs 743% above that baseline. That places it on the higher end for oxalate in its category. Why this matters: the gap between two Safe foods can be wide — one may hold 5 mg oxalate while another sits at 24 mg. The lower one leaves more room in your day. See all dairy & eggs rated Caution for a full side-by-side.

❓ Related Questions

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. For context, Soy Milk measures 28 mg per 1 cup, rated Caution.

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. Applied to Soy Milk: 28 mg oxalate per 1 cup — Caution per Harvard (2024).

Where does the oxalate data come from?

The numbers come from Harvard T.H. Chan SPH's 2024 laboratory measurements, published through the OHF database. Direct lab analysis, which is why they're treated as the reference values for food oxalate. Applied to Soy Milk: 28 mg oxalate per 1 cup — Caution per Harvard (2024).

Should I also check sodium and calcium?

Yes — oxalate alone doesn't decide stone risk. Sodium pushes more calcium into urine, and calcium from food (not supplements) helps bind oxalate during digestion. The main food page covers sodium and calcium alongside oxalate. Soy Milk comes in at 28 mg oxalate per 1 cup (Caution) in the measured database.

Soy Milk full page 🟢 Safe foods Caution foods
This is dietary reference information, NOT medical advice. Talk to your doctor or a registered dietitian before changing your diet. Oxalate tolerance varies by person, stone type, and medication.