Evidence supporting the use of: Trace minerals
For the body system: Nails

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Trace minerals—such as zinc, selenium, copper, iron, and manganese—are essential micronutrients required in small amounts for various physiological functions, including the maintenance of healthy nails. Scientific validation exists supporting the role of certain trace minerals, especially zinc and iron, in nail health. Deficiencies in these minerals can manifest as noticeable changes in the nails, such as brittleness, ridges, white spots, or slow growth. For example, iron deficiency is well-known to cause koilonychia (spoon-shaped nails), and zinc deficiency can lead to paronychia and other nail abnormalities.

Multiple studies and clinical observations have shown that correcting trace mineral deficiencies can improve nail health and appearance. However, for individuals with adequate nutritional status, additional supplementation provides limited benefit, as excess intake does not further enhance nail strength or growth and may even be harmful. There is less direct evidence for the role of other trace minerals like selenium, copper, and manganese, although they are involved in enzymatic processes that indirectly support keratin production and antioxidant protection in nail tissues.

In summary, while robust scientific evidence links adequate trace mineral intake—especially zinc and iron—to healthy nail structure, the strength of evidence for supplementation in the absence of deficiency is moderate. Trace minerals are best used to correct or prevent deficiencies rather than as a universal solution for nail health.

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