October 2015 in “Cosmetic Dermatology” Hair straightening changes hair structure and can cause damage if done wrong, but improvements in the methods are expected to continue.
Hair coloring and bleaching can permanently break down hair protein and temporarily change its properties.
Transglutaminases help form strong hair by linking proteins, and can potentially alter hair properties.
August 2023 in “Journal of Student Research” Human hair keratin mixed with rubber slightly improves its strength and biodegradability.
Alkylating agents can kill cancer cells but may cause skin and allergic reactions.