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Keratin is defined as "a hard, fibrous, sulphur-containing protein with an alpha-helix structure, found in the epidermis of vertebrates, mainly in the outermost layers of skin. Keratin can have several forms: in scales, feathers, hooves, horns, claws and nails it is hard, while wool and hair are made up of a soft and flexible form."[1]

When the natural protection of the foreskin for the glans penis is unavailable, the human body is noted for its ability to apply a layer of keratin to the glans penis as substitute protection. This is a late complication of circumcision and results in a partial loss of sensation in the glans penis. This process is called keratinization.

See also

External links

  • REFweb Wikipedia article: Keratin. Retrieved 14 January 2023.


  1. REFweb (2005). Keratin, The Free Dictionary by Farley. Retrieved 14 January 2023.