What is unique about vitamin D in the Pacific Northwest?
                                
                                
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                                    4 min read                                
                            
                                According to a UW Medicine expert, during the fall and winter, the sun's rays are too weak above the 37th parallel (which includes the entire Pacific Northwest) to produce any vitamin D, even on a sunny day. This unique geographical and seasonal challenge means residents must proactively manage their vitamin D levels to avoid deficiency and its associated health risks.