Many reasons: Hypothyroid, fungus, psoriasis, other diseases and nutritional deficiencies may be at issue, so you should get checked out by your doctor. However 20% of the population has "brittle nail syndrome", and can be improved by good nail cream, rubbing a moisturizer or body oil into your nails daily, and wearing protective gloves if hands are wet. Supplements that may help are b complex and zinc.
Answered 7/17/2013
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