Tyrosine is an amino acid that plays an important role in the human body. There are several synonyms for tyrosine including L-Tyrosine, 2-Amino-3-(4-hydroxyphenyl)propanoic acid, 4-hydroxyphenylalanine, and Tyrosinum. Tyrosine is a non-essential amino acid, which means that it can be synthesized by the body and is not necessary to obtain from food sources. It is used by the body to produce several important molecules such as neurotransmitters, hormones, and thyroid hormones. Tyrosine is also important in the production of melanin, which is responsible for skin pigmentation. Deficiencies in tyrosine can lead to several health problems including depression, low blood pressure, and chronic fatigue.