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Is Cauliflower Safe for Kidney Stones? (Safe)

Yes — Cauliflower is kidney-stone-safe. At just 2 mg oxalate per 1/2 cup, it lands well under the 25 mg safety line. This isn't an estimate or an average — Harvard's 2024 lab measured it directly via ion chromatography. You can eat Cauliflower regularly without it eating into your daily oxalate budget.
✓ Lab-Verified Data Based on Harvard T.H. Chan SPH oxalate data (2024) and NKF/AUA dietary guidelines.
2
mg oxalate
per serving
Food: Cauliflower, raw, boiled or steamed
Serving: 1/2 cup (60 g)
Verdict: 🟢 Safe
Per 100g: 3 mg
Data: Harvard T.H. Chan SPH (2024)
🔄 Lower-Oxalate Alternatives
🟢 Garlic
0 mg / serving
🟢 Kombu Seaweed
0 mg / serving
🟢 Wakame Seaweed
0 mg / serving
🟢 Passion Fruit or Granadilla
0 mg / serving
💡 What This Means for Your Diet

Here's the takeaway: Cauliflower earns a Safe rating (🟢) at 2 mg oxalate per serving. Being under 25 mg means it fits comfortably in everyday eating. Keep your usual habits — adequate fluids and calcium in meals — and Cauliflower poses no special concern.

📊 Cauliflower vs. Other Vegetables

Putting Cauliflower in context: it lands well below the category average of 27 mg. In the database, 80% of vegetables (219 of 271) fall in the 🟢 Safe group (under 25 mg oxalate/serving). The typical vegetables here averages 27 mg oxalate per serving, so Cauliflower runs 93% below that baseline. That places it among the lower-oxalate options 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 vegetables rated Safe for a full side-by-side.

❓ Related Questions

Why does the safe threshold matter?

The 25 mg cutoff comes from clinical guidance for stone formers. Below it, a food's oxalate contribution is small enough not to move the needle for most patients. Harvard's 2024 lab data sits behind these figures — direct measurements, not estimates. For context, Cauliflower measures 2 mg per 1/2 cup, rated 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, Cauliflower measures 2 mg per 1/2 cup, rated Safe.

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. For context, Cauliflower measures 2 mg per 1/2 cup, rated Safe.

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 Cauliflower: 2 mg oxalate per 1/2 cup — Safe per Harvard (2024).

Cauliflower full page 🟢 Safe foods Safe 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.