Are peanuts high in oxalate?
Yes. High, 29 mg per 1 oz
Range 29 to 40 mg across 2 studies, 28 g serving
Lower-oxalate swap: Pistachios, grade B, about 9 mg per 1 oz (about 49 nuts).
Peanuts are high in oxalate: about 29 mg per 1 oz, which is 58% of the 50 mg a day many stone clinics aim for, or 29% of the 100 mg others allow.
If your doctor has put you on a low-oxalate diet, eat it with something high in calcium, like milk, yogurt or cheese. Calcium in the same meal binds oxalate in the gut, so less of it reaches your urine. How much calcium, and what if you don't eat dairy.
50 or 100 mg a day: which target is yours
Why sources disagree on peanuts
Harvard measured oil-roasted peanuts at about 103 mg per 100 g, and a 2006 Thai study measured raw peanuts at 142. Either way, an ounce lands in the high band.
Where this number comes from
Each row is one published measurement, converted to a 28 g serving (1 oz). The grade and the range use the rows prepared the way the serving is eaten, and take the middle. How the grades work.
| Per serving | Per 100 g | Preparation | Source |
|---|---|---|---|
| 29 mg | 102.3 mg | oil roasted, salted | Harvard T.H, 2023 |
| 29 mg | 103.57 mg | Oil roasted | Harvard T.H, 2023 |
| 40 mg | 142 mg | raw seeds (legume seeds) | Judprasong K, Charoenkiatkul S, Sungpuag P, Vasanachitt K, Nakjamanong Y, 2006 |
By Oliver Silen · Data checked November 2, 2026 · Not medical advice