Are leeks high in oxalate?
C
Moderately. Moderate, 15 mg per 1 medium leek
One study at 15 mg, 89 g serving
0 mg50 mg = a day60 mg+
Lower-oxalate swap: Onion, grade A, about 1.9 mg per 1 medium onion.
Leeks have a moderate amount of oxalate: about 15 mg per 1 medium leek, which is 30% of the 50 mg a day many stone clinics aim for, or 15% of the 100 mg others allow.
50 or 100 mg a day: which target is yours
Where this number comes from
Each row is one published measurement, converted to a 89 g serving (1 medium leek). 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 |
|---|---|---|---|
| 15 mg | 17 mg | Raw (n=2) | Hönow R., Hesse A, 2002via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
By Oliver Silen · Data checked November 2, 2026 · Not medical advice