what are fingernails made of?
<answer> It is made of protein called keratin. <context> Fingernails are made of a special kind of protein called keratin, the same kind of stuff that a cow's hoofs and horns are made of.There are many different kinds of proteins. You need the protein of meat or milk or plant seeds in your diet. But don't chew your fingernails.You can't digest the keratin protein.ingernails are made of a special kind of protein called keratin, the same kind of stuff that a cow's hoofs and horns are made of.