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One extremely common cause of ridges on fingernails is malnutrition or malabsorption. Many vitamin deficiencies cause ridges on fingernails, as the body's production of the materials in the nail is interrupted. Eating a healthier diet and supplementing with vitamins can help clear up the ridges; for especially strong, health nails you can eat gelatin, which will also benefit your hair. If improvements to your diet do not resolve the ridges on your fingernails, you may have a disorder which interrupts the absorption of nutrients by your body, and you should see a doctor

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