yes
keratin
the integumentary system is composed of skin, hair, and nails
they are composed of a substance called keratin and together pot them....
Fingers and toes are no doubt composed of cells and tissues.
Parts composed of non living tissue, for example hair and nails.
tissues, nails, muscles, cells, blood, hair.....
Integument System
Finger and toe nails are composed mostly of a fibrous protein called keratin.
The primary component of human fingernails is the protein keratin. Secondarily, the cutaneous tips contain carbon, nitrogen and sulfur.
Your nails are weak because you aren't getting enough calcium. Therefore they are prone to breaking cracking and splitting. Try and have a glass of milk a day and if that doesn't work then try some hair and nail suppliments!
Hooves are made of material similar to the human fingernail. However it is much thicker and thus much stronger.