This one-tablet-per-day formulation addresses the cause of the symptoms 'from the inside'. It contains biotin in a dose which may help to improve nail strength in just 12 weeks. This is particularly helpful for people with thin, brittle nails. Always read the label. Follow the directions for use. If symptoms persist, talk to your health professional.Vitamins and supplements may be of assistance if dietary intake is inadequate. Ingredients Biotin (2.6mg), Silicon (40mg), Zinc (30mg), Iron (5mg), Vitamin C (50mg), St Mary's Thistle (1000mg) This product may not be right for you. Always read the label, warnings and instructions for use. The product advice is general in nature and does not replace the need to discuss your needs with a General Practitioner or other health professional. Vitamins should not replace a balanced diet.