Vitamin A: The Dual-Function Nutrient that is Both Hormone and Visual Pigment
                                
                                
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                                    4 min read                                
                            
                                According to the World Health Organization, vitamin A deficiency is the leading cause of preventable childhood blindness worldwide. This staggering statistic highlights the vital importance of the fat-soluble nutrient, which serves a unique dual function as both a visual pigment and a hormone.