🟢 Safe
Oxalate <25 mg/serving
🟡 Caution
Oxalate 25-99 mg/serving
🔴 Avoid
Oxalate ≥100 mg/serving
🟡

seeds, flaxseed

🟡 Caution — Moderate
72 mg oxalate / serving
Serving: 1/4 cup (29 g) | Per 100 g: 247 mg
✓ Medically Reviewed Content reviewed by OxalateWatch Editorial Team. Based on Harvard T.H. Chan SPH oxalate data (2024) and NKF/AUA dietary guidelines.

📊 Nutrition at a Glance

72 mg
Oxalate / serving
Moderate
Sodium / 100g
Pending
Protein / 100g
Pending
Calcium / 100g
Pending

📏 Oxalate by Serving Size

ServingWeightOxalateVerdict
1/4 cup29 g72 mg Caution
2 x 1/4 cup58 g144 mg Avoid
½ x 1/4 cup14 g36 mg Caution

🏷️ Tags

Nuts & Seeds Plant-Based Moderate Oxalate 🟡 Oxalate Caution

🟡 See all Nuts & Seeds rated Caution for kidney stones →

🔗 Related Foods

❓ Frequently Asked Questions

Can I eat seeds with kidney stones?

Proceed, but with awareness. seeds delivers 72 mg oxalate per 1/4 cup. That's moderate — above the safe line, below the danger line. Portion size is your friend here.

How much oxalate is in seeds?

72 mg — that's the oxalate in a standard 1/4 cup of seeds. For the 100g comparison freaks: 247 mg. Source is Harvard's 2024 food analysis project.

Is seeds high in oxalates?

It's in the moderate range. 72 mg per 1/4 cup sits between safe and high-risk. Manageable if you watch how much you eat.

What can I eat instead of seeds?

Substitutes exist. The safe alternatives listed below are all low-oxalate foods in the same family as seeds. Grab one of those and you dodge the oxalate while keeping similar flavors.

How reliable is the data for seeds?

The 72 mg oxalate figure is direct from Harvard's lab — measured, not estimated. The sodium/protein/calcium numbers aren't fully matched yet. When they are, we'll update.

How much seeds is safe to eat?

Size matters. 1/4 cup of seeds = 72 mg. Cut it in half, you're at roughly 36 mg. If you love this food, the half-portion strategy is your best compromise.

🔍 Explore More About This Food

📚 Data Sources

Oxalate: Harvard T.H. Chan School of Public Health (2024) via OHF.

📖 Key Scientific References

Taylor EN, Curhan GC. Oxalate intake and the risk for nephrolithiasis. J Am Soc Nephrol. 2007;18(7):2198-2204. PMID: 17538185
Borghi L, Schianchi T, Meschi T, et al. Comparison of two diets for the prevention of recurrent stones in idiopathic hypercalciuria. N Engl J Med. 2002;346(2):77-84. DOI: 10.1056/NEJMoa010369
Fink HA, Akornor JW, Garimella PS, et al. Diet, fluid, or supplements for secondary prevention of nephrolithiasis. Eur Urol. 2009;56(1):72-80. DOI: 10.1016/j.eururo.2009.03.031
Ferraro PM, Taylor EN, Gambaro G, Curhan GC. Dietary and lifestyle factors for primary prevention of nephrolithiasis. BMC Nephrol. 2020;21(1):267. PMID: 32652950
Pearle MS, Goldfarb DS, Assimos DG, et al. Medical management of kidney stones: AUA guideline. J Urol. 2014;192(2):316-324. DOI: 10.1016/j.juro.2014.05.006
Liebman M, Costa G. Effects of calcium and magnesium on urinary oxalate excretion after oxalate loads. J Urol. 2000;163(5):1565-1569. PMID: 10751889
Holmes RP, Assimos DG. The impact of dietary oxalate on kidney stone formation. Urol Res. 2004;32(5):311-316. DOI: 10.1007/s00240-004-0437-3
Lin BB, Lin ME, Huang RH, et al. Dietary treatment and fluid intake for prevention of recurrent calcium stones. PLoS One. 2021;16(4):e0250257. PMID: 33872340
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.