Is cornstarch high in oxalate?

Short answer: no. It's low in oxalate.

3mg oxalate per 1 cup
Easy pass
Low: under 10 mg per serving
Source: Harvard oxalate list (original). Values are per serving as listed in the source. Oxalate in real food varies with variety, soil and cooking.
Educational information only, not medical advice. Ask your doctor or dietitian how much oxalate is right for you.
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