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Is black beans (boiled) high in oxalate?

Short answer: it's moderate. Fine in normal portions, but it adds up.

10.5mg oxalate per 1/2 cup
Go easy
Moderate: 10 to 40 mg per serving
Try instead
Lentils (boiled)
2.4 mg
per 1/2 cup
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.