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🟢 Celery seed VS 🟡 Milk Thistle

If you're trying to decide between Celery seed and Milk Thistle for a kidney stone diet, the numbers tell a clear story. Celery seed has 1 mg oxalate vs Milk Thistle's 90 mg — that's a 90x difference measured by Harvard's lab.

✓ Lab-Verified Data Oxalate values from Harvard T.H. Chan SPH Oxalate Database (2024), measured via ion chromatography. This site is a dietary reference tool, not a medical resource.

⚖️ Head-to-Head Comparison

🟢
Celery seed
Safe — Low Oxalate
1 mg oxalate / serving
Serving: 1 tsp (2 g)
Per 100 g: 50 mg oxalate
Sodium: — | Calcium: — | Protein: —
🟡
Milk Thistle
Caution — Moderate Oxalate
90 mg oxalate / serving
Serving: 1 tsp (5 g)
Per 100 g: 1802 mg oxalate
Sodium: — | Calcium: — | Protein: —

🏆 The Verdict: Choose Celery seed

At 1 mg oxalate per serving (rated Safe), Celery seed is the clear winner over Milk Thistle (90 mg, Caution). The 90x difference comes from Harvard's 2024 lab measurements — this isn't an estimate or guess. Build your meals around Celery seed and use Milk Thistle sparingly, if at all.

🔍 Key Takeaways

Oxalate gap: 90 mg vs 1 mg per serving — a 90x difference. One of these is significantly easier to fit into a kidney stone diet.
Verdicts: Milk Thistle is rated Caution (25-99 mg/serving); Celery seed is rated Safe (under 25 mg/serving).
Serving strategy: If you choose Milk Thistle, consider a half portion or pair it with a calcium source. Celery seed can be eaten more freely.
Cooking tip: For either vegetable, boiling and discarding the cooking water can reduce soluble oxalate by 30-50%. Steaming or eating raw preserves more oxalate.

❓ Frequently Asked Questions

Which is better for kidney stones — Milk Thistle or Celery seed?

Straight answer: Celery seed. With 1 mg oxalate per serving (Safe), it's significantly safer than Milk Thistle (90 mg, Caution). The 90x gap is measured by Harvard's 2024 lab analysis, not estimates. Pick Celery seed for daily eating, save Milk Thistle for occasional use.

Can I eat Milk Thistle and Celery seed together?

You can, but be aware of the math. Together they'd total about 91 mg oxalate — which is in Caution territory. If both are in one meal, the oxalate load adds up. Better strategy: make Celery seed the main component and use Milk Thistle sparingly.

How should I prepare Milk Thistle vs Celery seed differently?

For Milk Thistle, boiling and draining cuts oxalate by 30-50%. Steaming preserves more. For Celery seed, preparation method matters less — it's already low-oxalate. If you're cooking both, boil Milk Thistle separately and discard the water.

What are good substitutes if I want to avoid Milk Thistle?

The obvious swap is Celery seed — same food category, 90x less oxalate. You can also browse the Vegetables category on OxalateWatch for other 🟢 Safe options. The key is sticking with foods rated Safe (under 25 mg/serving).

Browse all Vegetables 🟢 Low Oxalate Foods Celery seed page Milk Thistle page
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.