L-Tyrosine Hydrochloride is the salt form of L-Tyrosine (T899975), is one of the 22 proteinogenic amino acids that are used by cells to synthesize proteins. L-Tyrosine is biologically converted from L-phenylalanine and is in turn is converted to L-DOPA and further converted into the neurotransmitters such as dopamine, norepinephrine, and epinephrine.