Oxalate <25 mg/serving
Oxalate 25-99 mg/serving
Oxalate ≥100 mg/serving
Tomatoes have an undeserved bad reputation among some kidney stone patients because they're a nightshade. The nightshade-kidney-stone connection is weak science at best. Tomato products tend to be very low in oxalate — about 2-3 mg per serving for paste and sauce, and even less for raw tomatoes. What you should watch with tomato products is sodium — jarred pasta sauces and canned tomatoes can pack 400+ mg sodium per serving. Choose no-salt-added versions. The oxalate isn't the problem here. Marinara sauce on pasta is one of the safest comfort meals for kidney stone patients.
📊 Nutrition at a Glance
📏 Oxalate by Serving Size
| Serving | Weight | Oxalate | Verdict |
|---|---|---|---|
| 2 tbsp | 33 g | 2 mg | Low Oxalate |
| 2 x 2 tbsp | 66 g | 4 mg | Low Oxalate |
| ½ x 2 tbsp | 16 g | 1 mg | Low Oxalate |
🏷️ 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 Tomato paste if I have kidney stones?
Safe pick. 2 mg oxalate per 2 tbsp means Tomato paste 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 Tomato paste?
Here are the numbers: 2 mg oxalate in one 2 tbsp of Tomato paste (33g). Per 100 grams, that's 6.1 mg. Harvard T.H. Chan SPH did the lab work (2024) — these aren't database guesses.
Is Tomato paste low or high oxalate?
Nope. Tomato paste is a low-oxalate food — just 2 mg per 2 tbsp. Well under the 25 mg cutoff. You're in the clear with this one.
What are the best low-oxalate alternatives to Tomato paste?
Substitutes exist. The safe alternatives listed below are all low-oxalate foods in the same family as Tomato paste. Grab one of those and you dodge the oxalate while keeping similar flavors.
How reliable is the data for Tomato paste?
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.