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Brotin (B7) Shortfall→ Signs: Paper-thin nails, longitudinal ridges, splitting at the free edge.→ Science: Biotin supports keratin infrastructure. Studies show supplementation can improve thickness in deficient individuals—but food-first is safer and more sustainable.
Prioritize: Pasture-raised eggs (yolk intact), almonds, sweet potatoes, mushrooms, and leafy greens. Note: Raw egg whites contain avidin, which blocks biotin—always cook eggs. -
Iron Deficiency (Even Without Anemia)→ Signs: Spoon-shaped nails (koilonychia), extreme brittleness, pale nail beds.→ Science: Iron fuels oxygen delivery to the nail matrix. Subclinical deficiency impairs cell turnover long before hemoglobin drops.
Prioritize: Pair plant-based iron (lentils, spinach) with vitamin C (bell peppers, citrus) for absorption. Limit tea/coffee with meals—they inhibit uptake. -
Inadequate Protein→ Signs: Slow growth, white spots (not zinc-related, as once thought—often minor trauma), weak nail plate.
Prioritize: 20–30g protein per meal: Greek yogurt, salmon, lentils, chicken, or tofu. Collagen peptides (10g/day) may support nail strength—though whole proteins remain foundational.
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