Do I need vitamin D if I don't go outside? The indoor living guide
                                
                                
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                                    3 min read                                
                            
                                According to the National Institutes of Health, nearly one in four people in the United States have inadequate or low vitamin D blood levels, with some populations at higher risk, such as those who spend most of their time indoors. This raises a critical question: do I need vitamin D if I don't go outside?