Keratin is an extremely strong protein which is a major component in skin, hair, nails, hooves, horns, and teeth. The amino acids which combine to form keratin have several unique properties and keratin can be hard, like hooves, or soft, like skin. Keratin is actually dead. Hair, skin, and nails are all formed from dead cells which the body sheds as new cells push up from underneath. If the dead cells of your hair or nails is kept in good condition and moisturized, it will provide an insulating layer to protect the delicate new keratin below them.
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