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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 Vitamin B12 Deficiency and its Numerous Skin Manifestations Actas Dermo Sifiliogrficas Total melanonychia of 20 nails as a rare manifestation of vitamin B12 deficiency PMC Hair, nail, and pigment changes in major systemic disease ScienceDirect
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