Hair Hair Return to Scientific Hair is produced by hair follicles in the skin. The follicles have a limited life of 4 months to 7 years. They are then replaced by new follicles. The hair is produced by living follicle cells that have the DNA that later can be detected.
Hair is made of proteins that are later keratinized.
This is a dead material similar in chemical formula to nails, claws, and compressed to form rhinoceros horn. Some heavy metals are secreted into the hair. Arsenic poisoning can be detected by measuring the arsenic in the hair and it is possible to calculate when and for how long the arsenic was administered. Follicles genetically vary, producing flattened hairs which are curly, or round hairs which are straight. If you flatten a straight hair by running it between two finger nails, it will become curly.