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Some diseases are also associated with changes in the nails, which can include brittleness. Thin and brittle nails can be a sign of hypothyroidism, for example. The term onychoschizia refers to splitting of the fingernails as well as brittle or soft nails. Taking biotin (a vitamin) supplements can help in some cases of brittle nails, and application of moisturizers after soaking in water can also be of benefit. Medically Reviewed by a Doctor on 3/30/2015.
Silicon is present in hair and nails. Clinical trials have also found a benefit to silicon supplementation on hair brittleness. Zinc concentrations are high in the skin and deficiency of this mineral leads to dermatitis and other skin disorders. Thiamine [vitamin B1] supports normal growth and development of all tissues in the body. It is one of the best best vitamins for hair skin and nails. In addition, it appears to have an antioxidant role which is particularly effective in the skin. Oxidative damage can lead to premature aging of the skin, which can be identified by increased wrinkling, ragging and sunspots.