What Constitutes a Severe Vitamin D Deficiency?
                                
                                
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                                    4 min read                                
                            
                                According to the National Institutes of Health, vitamin D deficiency is a widespread issue, with many people experiencing low levels, often without noticeable symptoms. But beyond general insufficiency lies a critical state, and understanding **what constitutes a severe vitamin D deficiency** is vital for preventing serious health consequences, such as bone disorders and long-term complications.