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Is popcorn (air-popped) high in oxalate?

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

3.5mg oxalate per 3 cups
Easy pass
Low: under 10 mg per serving
Source: Harvard oxalate list (2023 revised). Values are per serving as listed in the source. Oxalate in real food varies with variety, soil and cooking. Harvard Oxalate Table 2023 ↗
Educational information only, not medical advice. Ask your doctor or dietitian how much oxalate is right for you.