How long does it take for high strength vitamin D to work?
                                
                                
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                                    4 min read                                
                            
                                According to research, high-dose vitamin D supplementation can significantly increase serum vitamin D levels within weeks, although symptom improvement can take longer. The timeline for how long it takes for high strength vitamin D to work depends on several key factors, including your initial deficiency level, the form of vitamin D used, and your individual health.