How Long Does It Take to Notice a Difference with Vitamin D3?
                                
                                
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                                    5 min read                                
                            
                                According to research published by the National Institutes of Health, vitamin D deficiency affects a significant portion of the global population. When you begin supplementation, a common question arises: how long does it take to notice a difference with vitamin D3? The answer depends on individual factors, but most people can expect initial improvements within a few weeks.