What Vitamin Deficiency Causes Eyebrow Thinning?
                                
                                
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                                    4 min read                                
                            
                                According to dermatologists, nutritional deficiencies are a common, but often overlooked, cause of hair loss, including in the eyebrows. Finding out what vitamin deficiency causes eyebrow thinning is the first step toward correcting the issue and restoring hair growth.