Is it Safe to Chew Castor Seed? The Dangers of Ricin
                                
                                
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                                    3 min read                                
                            
                                Chewing and swallowing just a few castor seeds can be lethal to an adult, according to a review of poisoning cases from the DTIC. This is because the seeds contain one of the most potent plant-based toxins known to man: ricin.