Hair, skin, and nail supplements commonly contain antioxidants such as vitamins A, C, and E, or Coenzyme Q10, as well as biotin, a B-complex vitamin. The minerals manganese and selenium are often found in supplements marketed for healthy hair, along with fatty acids such as fish oil and flaxseed oil.
Most people get enough of the nutrients mentioned above through diet, but in rare cases, a medical problem may cause a deficiency or affect your hair, nails, or skin. People who take antibiotics long-term or use antiseizure drugs, for instance, are more likely to be biotin-deficient. An over- or underactive thyroid may cause hair loss and dry strands. Iron-deficiency anemia can lead to brittle, oddly shaped nails.
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