Is Vitamin D Added to Milk in the US? The Complete Fortification Guide
                                
                                
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                                    4 min read                                
                            
                                Since the 1930s, most milk sold in the United States has been voluntarily fortified with vitamin D as a public health initiative to prevent rickets. While not a federal mandate, the practice is now standard for nearly all processed cow's milk and many plant-based alternatives.