Nails beauty - Winter care

In the winter, especially, nails become brittle, rough, ridged and seem to peel. Does this mean I have a vitamin deficiency? What should we do to solve this problem?Diets often change during the winter,and marginal deficiencies may show up. Insufficient protein seems to be high on the list,though the often-recommended use of gelatin does not seem to be adequate. However, I find that improving