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Biotin and Vitamin E also help nails. And hair. I've been taking Vitamin E for years and just started the Biotin. Women especially need iron since we usually bleed monthly we lose a lot of iron that way.
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.