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Longitudinal Melanonychia: Brown Line on Nails 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 How Vitamin B12 Deficiency Affects Nails Core Med Science Brown nails as clues for shock diagnosis Inaba 2025 Journal of General and Family Medicine Wiley Online Library Hair, Nails, and Skin: Differentiating Cutaneous Manifestations of Micronutrient Deficiency DiBaise 2019 Nutrition in Clinical Practice Wiley Online Library
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