Oxalate <25 mg/serving
Oxalate 25-99 mg/serving
Oxalate ≥100 mg/serving
📊 Nutrition at a Glance
📏 Oxalate by Serving Size
| Serving | Weight | Oxalate | Verdict |
|---|---|---|---|
| 1 tsp | 2 g | 1 mg | Safe |
| 2 x 1 tsp | 4 g | 2 mg | Safe |
| ½ x 1 tsp | 1 g | 0.5 mg | Safe |
🏷️ Tags
🟢 See all Vegetables rated Safe for kidney stones →
🔗 Related Foods
🟢 Safe alternatives (recommended)
⚠️ Other foods in this category to watch
❓ Frequently Asked Questions
Should I avoid Fennel seed if I have kidney stones?
Safe pick. 1 mg oxalate per 1 tsp means Fennel seed is comfortably in the green zone. Harvard's 2024 lab data says so. No need to track this one obsessively.
How much oxalate is in Fennel seed?
One 1 tsp of Fennel seed = 1 mg oxalate. Scale it up to 100g and you're at 50 mg. Direct measurement from Harvard, 2024. About as reliable as food data gets.
Is Fennel seed high in oxalates?
Nope. Fennel seed is a low-oxalate food — just 1 mg per 1 tsp. Well under the 25 mg cutoff. You're in the clear with this one.
What can I eat instead of Fennel seed?
Don't give up the whole category — just pick a safer member of it. The green foods in the related section all work as substitutes for Fennel seed with a fraction of the oxalate.
How reliable is the data for Fennel seed?
Oxalate: very reliable (Harvard 2024 lab measurement). Other nutrients: still being matched to USDA data. The oxalate figure is what matters for a kidney stone decision, and that one's solid.