What nutrient deficiency causes eyebrow hair loss? A guide to nutritional links.
                                
                                
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                                    4 min read                                
                            
                                According to the World Health Organization, iron deficiency is the most common nutritional deficiency globally, and it is also a well-known cause of hair loss. This makes it a primary suspect when asking **what nutrient deficiency causes eyebrow hair loss** and affects follicles beyond the scalp. However, iron is not the only culprit, as other vitamins and minerals also play critical roles in hair growth.