Is vitamin D ok to take alone? Why companion nutrients are essential
                                
                                
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                                    4 min read                                
                            
                                An estimated 1 billion people worldwide have a vitamin D deficiency, making supplementation common. But a question many people have is: **is vitamin D ok to take alone?** The simple answer is that while you can take it solo, its safety and effectiveness are significantly enhanced when paired with other key nutrients.