Selenium

The trace mineral for thyroid and hair health

100–200mcg of selenium (selenomethionine form) daily. Selenium is essential for thyroid hormone conversion — and thyroid dysfunction is a leading cause of diffuse hair loss, dry skin, and fatigue often mistaken for aging. It also activates glutathione peroxidase, the body's master antioxidant enzyme, protecting follicles from oxidative damage. Deficiency is common in soil-depleted regions.