What material are fingernails made of?
Fingernails are made of keratin
finger nails are made up of the same stuff that's in your hair its a substance called keratin which is an extremely hard protein.. This same substance is also found in skin, hooves, horns and teeth.
Fingernails are actually cells that grow from the matrix which is hidden part of the nail and is located under the cuticle. Fingernails are made up of a material called Keratin, which is also the material that makes up hair and animal horns/antlers. Bones are made up of, primarily, Osseous Tissue, which is the hard connective tissue that supports the skeletal system.