Is mustard high in oxalate?
A
No. Very low, <1 mg per 1 tsp
One study at <1 mg, 5 g serving
0 mg50 mg = a day60 mg+
Mustard is low in oxalate: about <1 mg per 1 tsp, which is 1% of the 50 mg a day many stone clinics aim for, or 1% 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 5 g serving (1 tsp). 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 |
|---|---|---|---|
| <1 mg | 12 mg | Yellow | Harvard T.H. Chan School of Public Health [1] |
By Oliver Silen · Data checked November 2, 2026 · Not medical advice
