Selenium is an essential trace mineral recognized for its role in antioxidant defense and thyroid function, but it also contributes to the maintenance of healthy nails. Scientifically, selenium forms part of selenoproteins, which help prevent cellular damage from free radicals. Deficiency in selenium has been associated with various nail abnormalities, such as white nail beds, discoloration, and nail fragility. Several clinical reports and case studies document nail changes—such as brittleness, pseudo-leukonychia, and slow growth—in individuals with selenium deficiency, which are often reversible upon selenium supplementation.

However, while these findings indicate that selenium is necessary to prevent deficiency-related nail problems, there is limited evidence that selenium supplementation improves nail health in individuals with normal selenium status. Most studies focus on correcting deficiency rather than enhancing nail strength or appearance in the general population. Consequently, selenium is justified for supporting the nails in the context of deficiency, but not as a general supplement for nail health in otherwise healthy individuals.

In summary, the use of selenium for nail support is scientifically validated, but its benefits are primarily observed in the context of deficiency correction rather than general enhancement.