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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.
Dr. Richard Scher, a dermatologist who is widely known for his expertise on nail care and disorders, argues that it isn't totally clear what role biotin plays. However, he believes taking the vitamin does improve the keratin infrastructure (a basic protein that makes up hair, skin and nails). Biotin deficiency is rare and low levels may result in brittle nails and hair loss, explains Dr. Stuart. However, hair loss and brittle nails may have multiple causes and taking biotin supplements may actually halt this process and even help to reverse it.. The general daily recommended dosage of biotin is 2.5 mg, according to Dr. Scher.