Silicon, particularly in its bioavailable form as orthosilicic acid, has been studied for its role in supporting nail health. Scientific research indicates that silicon is an essential trace element involved in the synthesis of collagen and glycosaminoglycans, which are critical components of connective tissues, including nails. Several small clinical studies and observational data suggest that silicon supplementation may improve nail strength and reduce brittleness in individuals with fragile nails. For example, a double-blind, placebo-controlled study found that women who took choline-stabilized orthosilicic acid showed improved nail hardness and resistance to breaking after supplementation. However, the number of high-quality, large-scale human trials is limited, and the precise mechanisms by which silicon influences nail growth and quality are not fully understood. While silicon is not universally acknowledged as an essential nutrient for nails, the available scientific evidence supports its use to a moderate degree, particularly in populations with low dietary silicon intake or poor nail quality. Thus, silicon’s use for nail support is justified by emerging scientific evidence, though more robust research is needed for definitive conclusions.