What is the Toxin in Rhubarb and Why are the Leaves Poisonous?
                                
                                
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                                    3 min read                                
                            
                                Rhubarb leaves contain a significant amount of oxalic acid, a compound that is poisonous to both humans and animals. In fact, the ASPCA identifies rhubarb as toxic to pets. This guide explains why the leaves are dangerous and how to safely enjoy rhubarb stalks.