Oxalate <25 mg/serving
Oxalate 25-99 mg/serving
Oxalate ≥100 mg/serving
📊 Nutrition at a Glance
The form here is the concentrated one, and that matters for reading the table: dehydration and grinding reduce water weight, so oxalate per standard serving rises relative to the fresh version of the same base food. Milk Thistle (Seed Powder) lands at 90 mg per serving, at the high end of the family across the family's measured range. Related forms in this family: Milk Thistle (Seed) (46 mg).
📏 Oxalate by Serving Size
| Serving | Weight | Oxalate | Verdict |
|---|---|---|---|
| 1 tsp | 5 g | 90 mg | Moderate Oxalate |
| 2 x 1 tsp | 10 g | 180 mg | High Oxalate |
| ½ x 1 tsp | 2 g | 45 mg | Moderate Oxalate |
🏷️ Tags
🟡 See all Vegetables rated Caution for kidney stones →
🔗 Related Foods
🟢 Safe alternatives (recommended)
⚠️ Other foods in this category to watch
❓ Frequently Asked Questions
Is Milk Thistle safe for kidney stones?
Proceed, but with awareness. Milk Thistle delivers 90 mg oxalate per 1 tsp. That's moderate — above the safe line, below the danger line. Portion size is your friend here.
How much oxalate is in Milk Thistle?
Here are the numbers: 90 mg oxalate in one 1 tsp of Milk Thistle (5g). Per 100 grams, that's 1802 mg. Harvard T.H. Chan SPH did the lab work (2024) — these aren't database guesses.
Is Milk Thistle a high-oxalate food?
Moderate. Milk Thistle has 90 mg oxalate per 1 tsp — not high enough to panic, not low enough to ignore. Portions matter with this one.
What are the best low-oxalate alternatives to Milk Thistle?
There are almost always safer swaps in the same food family. For Milk Thistle, check the related foods section below — the green-marked ones are your best bets. All verified by Harvard (2024).
How much Milk Thistle is safe to eat?
A standard serving (1 tsp) of Milk Thistle gives you 90 mg oxalate. Half that = 45 mg. That's the difference between a caution-level and a safe-level meal. Portions matter a lot here.
How reliable is the data for Milk Thistle?
The oxalate number for Milk Thistle — 90 mg per serving — is from Harvard's 2024 lab analysis. That part is solid. The USDA nutrition data (sodium, protein, calcium) is still being matched — we'll update when it's available.