Are mushrooms high in oxalate?
A
No. Very low, <1 mg per 1 cup sliced
Range 0 to <1 mg across 2 studies, 70 g serving
0 mg50 mg = a day60 mg+
Mushrooms are low in oxalate: about <1 mg per 1 cup sliced, which is 1% of the 50 mg a day many stone clinics aim for.
Boiling and draining lowers oxalate, because the soluble part leaches into the water. Compare the raw and boiled rows below.
Where this number comes from
Each row is one published measurement, converted to a 70 g serving (1 cup sliced). 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 |
|---|---|---|---|
| 0 mg | 0 mg | Raw | Harvard T.H, 2023 |
| <1 mg | 0.5 mg | Boiled (n=1) | Hönow R., Hesse A, 2002via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
| <1 mg | 0.7 mg | Canned (n=3) | 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