What Light Does Vitamin D Come From? Understanding the Sunshine Vitamin
                                
                                
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                                    3 min read                                
                            
                                According to the National Institutes of Health, over one billion people worldwide have a vitamin D deficiency. It is this widespread issue that makes understanding what light vitamin D comes from so vital for overall health and wellness. The answer lies in the sun's powerful ultraviolet-B (UVB) rays.