Which vitamins are good for dry rugh skin?

Only if you are: Deficient. Deficiency of Niacin causes a skin rash, pellagra. If you eating a mixed diet, your rough skin is not likely to be due to vitamin deficiency. You may take a multivitamin tablet for three months to see if it helps. It may be more useful to use a vaseline type skin moisturizer.

Limited use : Vitamins taken by mouth has little impact on dry skin unless the doses are high , such as with vitamin a , but there is a risk of toxicity and as such that dosing would not be recommended. Better yet , use topical moisturizers that contain aha's or urea , as those ingredients are therapeutic.