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Nail Changes and Nutrition: What Do We Know Now? Podiatry Today Melanonychia: Etiology, Diagnosis, and Treatment PMC Vitamin B12 Deficiency and its Numerous Skin Manifestations Actas Dermo Sifiliogrficas Our nails can reveal more than you might expect. Changes in color, texture, or thickness may signal diabetes, nutrient deficiencies, or other health concerns. These signs are easy to overlook, but Reversible Melanonychia Revealing Nutritional Vitamin B12 Deficiency PMC Blue Nail Discoloration: Literature Review and Diagnostic Algorithms American Journal of Clinical Dermatology Springer Nature Link
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