What is the Purpose of Vitamin J?
                                
                                
                                •
                                
                                
                        
                                    
                                    4 min read                                
                            
                                While most people are familiar with vitamins A through K, many don't know that several letters in the alphabet were once used for substances later reclassified or deemed non-essential, including Vitamin J. This elusive "vitamin" is now known as choline, an essential nutrient with crucial roles in health, despite not fitting the traditional vitamin definition.