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 & Treatment Total melanonychia of 20 nails as a rare manifestation of vitamin B12 deficiency JAAD Case Reports 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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