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Melanonychia: What It Is, Causes, and More Part 3: Signs of Vitamin Deficiency! White Spots on Nails! do brown fingernails indicate glutathione deficiency Nail color changes as signs of underlying disease 6 Signs of Vitamin Deficiency Longitudinal Melanonychia: Brown Line on Nails Brown nails as clues for shock diagnosis Inaba 2025 Journal of General and Family Medicine Wiley Online Library Did you know your fingernails can tell you more than you think? Unusual changes in your nails, such as discoloration or brittleness, could be a sign of underlying health issues. Don't overlook
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