Vitamins for Weak Nails

Thin, weak nails that break easily may indicate a nutritional deficiency or a more serious medical condition. In most cases, taking a multivitamin or one of many single vitamins known to increase the strength of weak nails will yield the results you desire. If your nails don't improve after several months of taking vitamins, consult a qualified physician. Your weak nails may be caused by a treatable medical condition not related to nutrition.

Biotin

Biotin, a B vitamin, may strengthen brittle, weak nails, according to a 1989 German study conducted by G.L. Floersheim and published in the medical journal Zeitschrift Hautkrankheiten. In the study, 71 patients were given 2 1/2 mg of biotin orally for 5 1/2 months. At the end of the study, 91 percent of the patients treated with biotin experienced an improvement in firmness and hardness of nails. Although positive results did not occur in all people, individuals with weak nails may try taking 2 1/2 mg of biotin daily for a trial period of at least a few months.

Zinc

Zinc, an essential vitamin for nails and hair, also plays an important role in overall health. According to Amy Rose in her book "Natural Healing Wisdom & Know How," a zinc deficiency can lead to thin, brittle and weak nails that develop cracking, peeling, ridges and white spots. To improve the health and strength of your fingernails, try taking 50 to 100 mg of zinc daily in capsule form. You can also increase your consumption of foods that contain zinc such as green leafy vegetables, brewer's yeast, legumes, seeds and whole grains.

Iron

If you have an iron deficiency, your fingernails will show it. Individuals who don't get enough iron often have brittle, weak nails, according to Lisa Drayer, author of "The Beauty Diet." To strengthen the nails, try eating iron-rich foods such as oysters, tomatoes, spinach, clams, lean beef, chicken, soybeans, shrimp, lentils, beans and bran flakes. You can also take an iron supplement, but check with your doctor for a safe dosage. Over-consumption of iron can cause serious side effects.

Other Vitamins

Many nutritional therapies have been suggested for strengthening weak nails. Some of the most commonly prescribed vitamins include calcium, vitamin A, vitamin C and magnesium. If lack of iron is your problem, try taking vitamin C supplements. Drayer suggests that this may increase your body's ability to absorb iron. For the best results, take a multivitamin each day to ensure your body receives adequate vitamins and minerals to produce strong nails.