Threonine

Threonine is an amino acid that is used in hair care because of it's growth and protein promotion properties, that helps with making the hair strands stronger and grow faster. Threonine is also very good as a conditioning agent that hydrates hair strands. Besides, Threonine has antistatic properties, that avoid frizz. Threonine can be found in vegetable sources such as soybeans and letils.