Code of Federal Regulations Title 21. Food and Drugs § 21.895.101 Prosthetic hair fibers

Prosthetic hair fibers are devices intended for implantation into the human scalp to simulate natural hair or conceal baldness. Prosthetic hair fibers may consist of various materials;  for example, synthetic fibers, such as modacrylic, polyacrylic, and polyester;  and natural fibers, such as processed human hair. Excluded from the banned device are natural hair transplants, in which a person's hair and its surrounding tissue are surgically removed from one location on the person's scalp and then grafted onto another area of the person's scalp.