How quickly does vitamin D start to work?: A comprehensive nutrition guide
                                
                                
                                •
                                
                                
                        
                                    
                                    4 min read                                
                            
                                Did you know that an estimated 1 billion people worldwide are vitamin D deficient? For those starting supplementation, understanding **how quickly does vitamin D start to work?** involves appreciating the nuanced timeline, from initial absorption to experiencing noticeable health benefits, which can take weeks to months.