Rhubarb leaves contain a significant amount of oxalic acid, which can be harmful if consumed in large quantities. Symptoms of oxalic acid toxicity may include mild gastrointestinal issues as well as more serious complications like kidney stones and kidney failure. It is important to note that although rhubarb stalks are commonly used in cooking and are generally considered safe to eat, the leaves should be avoided due to their high oxalic acid content.
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