Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Protein plays a crucial role in supporting the health of nails, and its use for this purpose is grounded in scientific evidence. Nails are composed primarily of a fibrous structural protein called keratin. Adequate dietary protein provides the amino acids necessary for the synthesis of keratin and, consequently, for nail growth and strength. Clinical studies and nutritional science consistently demonstrate that protein deficiency can lead to brittle, weak, or slow-growing nails. For example, malnutrition states such as kwashiorkor, which involve low protein intake, are associated with distinct nail abnormalities.

While supplementing with extra protein beyond normal dietary needs does not necessarily enhance nail growth in individuals who are not deficient, maintaining sufficient protein intake is recognized as essential for normal nail structure and function. The American Academy of Dermatology and other authoritative bodies note that nail changes can be a marker of protein deficiency and stress the importance of balanced nutrition for nail health. In summary, the link between protein intake and nail health is well-established, with deficiency clearly resulting in compromised nail integrity.

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