do brown fingernails indicate glutathione deficiency Nail changes can reflect underlying hormonal and metabolic disorders. Features like onycholysis suggest hyperthyroidism, while brittle or slow-growing nails point to hypothyroidism. Findings such as koilonychia and thickened nails may systemic Melanonychia: What It Is, Causes,

Melanonychia: What It Is, Causes, and More Part 3: Signs of Vitamin Deficiency! White Spots on Nails! Total melanonychia of 20 nails as a rare manifestation of vitamin B12 deficiency PMC Total melanonychia of 20 nails as a rare manifestation of vitamin B12 deficiency JAAD Case Reports

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