Is asparagus high in oxalate?
No. Low, 5.5 mg per 1/2 cup cooked
Range 2.3 to 8.7 mg across 2 studies, 90 g serving
Asparagus is low in oxalate: about 5.5 mg per 1/2 cup cooked, which is 11% of the 50 mg a day many stone clinics aim for, or 6% of the 100 mg others allow.
50 or 100 mg a day: which target is yours
Boiling and draining lowers oxalate, because the soluble part leaches into the water. Compare the raw and boiled rows below.
Why sources disagree on asparagus
The 2 studies here run from 2.3 to 8.7 mg per 1/2 cup cooked, measured between 2002 and 2023. Variety, growing conditions and lab method all move the number.
Where this number comes from
Each row is one published measurement, converted to a 90 g serving (1/2 cup cooked). 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 |
|---|---|---|---|
| 2.3 mg | 2.6 mg | Boiled (n=3) | Hönow R., Hesse A, 2002via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
| 8.7 mg | 9.67 mg | Boiled | Harvard T.H, 2023 |
By Oliver Silen · Data checked November 2, 2026 · Not medical advice