Oxalate <25 mg/serving
Oxalate 25-99 mg/serving
Oxalate ≥100 mg/serving
📊 Nutrition at a Glance
🚨 High Sodium Alert
Spirulina contains 1048 mg sodium per 100g — well above the recommended limit for kidney stone patients. High sodium intake can increase calcium in urine, raising stone risk.
📏 Oxalate by Serving Size
| Serving | Weight | Oxalate | Verdict |
|---|---|---|---|
| 1 serving | 100 g | 0 mg | Safe |
| 2 x 1 serving | 200 g | 0 mg | Safe |
| ½ x 1 serving | 50 g | 0 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 Spirulina if I have kidney stones?
Short answer: yes. Longer answer: at 0 mg per 1 serving, Spirulina is one of the safer things you can eat if you're watching oxalate. Harvard T.H. Chan SPH measured this directly.
How much oxalate is in Spirulina?
One 1 serving of Spirulina = 0 mg oxalate. Scale it up to 100g and you're at 0 mg. Direct measurement from Harvard, 2024. About as reliable as food data gets.
Is Spirulina high in oxalates?
It's low. 0 mg per 1 serving is well under the 25 mg danger line. Spirulina is not the food you need to worry about.
What are the best low-oxalate alternatives to Spirulina?
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 Spirulina with a fraction of the oxalate.
Is Spirulina high in sodium?
Sodium warning: Spirulina packs 1048 mg per 100g. That's high enough to push extra calcium into your urine — a stone risk you don't need. Pick low-sodium versions if they exist.