Are sardines full of heavy metals? The surprising truth
                                
                                
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                                    4 min read                                
                            
                                According to the FDA, the average mercury concentration in sardines is an extremely low 0.013 parts per million, significantly less than in larger fish. So, are sardines full of heavy metals? The truth is, while all seafood contains some contaminants, sardines are one of the safest options due to their position low on the marine food chain.