Can Low Vitamin D Cause Low IgA? Unpacking the Immunological Link
                                
                                
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                                    4 min read                                
                            
                                Research has long established that vitamin D plays a critical role beyond bone health, with one study of children with rickets finding significantly lower IgA levels compared to healthy controls. This evidence suggests a profound connection, leading many to ask: can low vitamin D cause low IgA?