The source material covers three of the six nutrients listed in the original guide — protein, biotin and iron. The full framework also addresses additional micronutrients not detailed in the available excerpt. For readers whose nail changes persist despite dietary adjustments, the next step is a blood test to identify specific deficiencies, followed by a conversation with a healthcare provider about whether a targeted dietary supplement is appropriate. The question of which nutrient combinations produce the best results — and at what doses — remains an active area of nutrition research.
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