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🟢 Celery seed VS 🟡 Milk Thistle

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

✓ Medically Reviewed Content reviewed by OxalateWatch editorial team. Based on Harvard T.H. Chan SPH oxalate data (2024) and NKF/AUA dietary guidelines.

⚖️ 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?

The numbers leave no doubt: Celery seed (1 mg oxalate/serving, Safe) beats Milk Thistle (90 mg, Caution) by a factor of 90x. For kidney stone patients, Celery seed is the pick. Milk Thistle is a food to approach with portion awareness.

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?

Boil and drain Milk Thistle to cut oxalate. Celery seed can be prepared any way — it's already in the safe zone regardless of cooking method. If making a dish with both, prepare them separately so you can boil the higher-oxalate one.

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

Celery seed is the #1 substitute in the same category. Beyond that, look for foods with the 🟢 Safe rating in the Vegetables category — they're all under 25 mg oxalate per serving and verified by Harvard (2024).

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.