Silica, also known as silicon dioxide (SiO2), is a naturally occurring mineral commonly found in sand, quartz, and various rocks. It is also a popular ingredient in dietary supplements and skincare products due to its purported health benefits. Silica supplements, often marketed for their ability to improve hair, skin, and nail health, contain varying amounts of silica in various forms, such as silica gel, colloidal silica, and horsetail extract. While some studies have suggested positive effects of silica on these aspects, more substantial scientific evidence is needed to fully understand and validate its purported benefits.