Taking vitamins to improve the appearance of hair, skin and nails has been effective for individuals who lack certain vitamins in their daily diets.There are specific vitamins that aid in the processes by which hair, skin and nails grow.eta-carotene, vitamin B complex, vitamin C, vitamin E, magnesium, sulfur and zinc are all vital for growing healthy hair, skin and nails, according to the Vitamins and Nutrition Center. A multivitamin will contain most if not all of these vitamins.